Recently, Twitter rolled out a couple of new photo features, one of which is the ability to tag the people in a photo. If you'd rather not be tagged in Twitter photos, here's how to prevent it from happening.

Keeping your digital music tagged with artist and title details is essential if you want to find a particular track, and it's pretty uncontroversial if the song in question is performed by a single artist. But what if it's one of the innumerable songs 'featuring' a guest performance by another artist?

There's plenty of technology to help you get your digital music collection into shape, but most approaches are designed with an artist-centric pop music approach in mind. Lifehacker reader Chris outlines an alternative approach to use if you have a large classical music collection and want to play movements in the correct order.

Most of us have spent years building up our digital music libraries, along with tons of missing, mismatched and incorrect tags on your music over that time. Here's a step-by-step guide for organising your entire library, once and for all.

newVideoPlayer( {"type":"video","player":"http://www.youtube.com/v/vi_OM7i9_hA&hl=en&fs=1&fmt=22","customParams": ,"width":500,"height":412,"ratio":0.824,"flashData":"","embedName":null,"objectId":null,"noEmbed":false,"source":"youtube"} );If you're part of a group or business that uses a blog, wiki, chat software, bug tracking, or other webapps to track progress, Flowdock wants to help you organise all that with a streamlined look and tag-based organising.

If you find yourself bookmarking things left and right but rarely ever getting back around to looking through your bookmark collection, NetRocket can help you wrangle your bookmark mountain.

Window/Linux: Fixing a tag here and there is one thing, but what if your MP3 collection is in need of a deep and serious massaging to get things in order? MP3 Diags lets you dig into the guts of MP3s.

Windows/Mac OS X: Free application BPM Analyzer determines the beats per minute (BPM) of any MP3 on your computer, then automatically updates the ID3 tags with the BPM info—perfect for finding workout music to hit the 120-140 BPM sweet spot.

Windows only: The bigger your iTunes library, the more difficult it becomes to locate and fix any problems that arise, whether you're faced with play counts or ratings gone awry, missing or duplicate tracks, or missing album art. That's where diagnostic tool meta-iPod comes in handy.

Windows/Mac/Linux: MindRaider wants to be the place you stash all your sudden thoughts, organizational notes, and inter-connected ideas. That's because it offers links, visualisations, and other tools to help you make sense of it all.

Windows only: Use the same kind of quick-thinking, fast-organising tags you use to organise your web life with TaggedFrog, a free Windows utility that sorts and finds any file you can throw at it. Windows Vista (and the Windows 7 beta) already have native tagging systems, and OS X has long offered search-able metadata as a simple filing system. Vista's tagging is limited to certain file types, though, and it's in need of a central tag station, much like the one TaggedFrog provides. TaggedFrog tags any file you have with any words you want, so you can selectively tag files to separate projects, keep a track of any MP3s with curse words in them, or whatever quick-search needs you have. As you search, a "cloud" view shows the most-accessed, or most-tagged, keywords, and you can narrow your search by file extension for heavily-used tags. There's a portable, no-install version available at the program page, so even if you only want to try out TaggedFrog for a quick MP3 organisational mission, you're good to go. TaggedFrog is a free download for Windows systems, requires the .NET 2.0 framework for both the installed and portable versions.

TaggedFrog

It's tucked away, but bookmarking site Del.icio.us now offers bulk tag editing (in, of course, beta) for group tagging/un-tagging and sharing/un-sharing. Helpful stuff, especially for pesky tag typos. Thanks Gergo!

New image recognition webapp ALIPR (Automatic Linguistic Indexing of Pictures in Real-Time) is a on a mission to assign relevant tags to digital images based on their content, and wants you to help it learn. While digital image recognition has come a long way in recent years, it's still got a long way to go, and ALIPR's got its share of hits and misses. Upload an image to ALIPR or hand it a URL of an image already online, and the engine will suggest tags, and ask you to add to its list. Some of ALIPR's suggestions are spot-on, but others are way off. You can confirm the hits and suggest other tags to help the engine learn. Check out how ALIPR did with a few images from my Flickr photostream.

Windows only: Rename the thousands of MP3 files in your digital music library and add or edit tags, lyrics, and album art in one fell swoop with free utility TagScanner. Not only can TagScanner clean up the artist, album, song title, and track number information for your digital music files, it can rename your songs based on a pattern you define (like %artist% - %title%), it can make music playlists, and search online databases like freedb and Amazon to automatically tag music missing information. It includes a built-in player as well so you can listen to tracks while you edit. We've recommended Media Monkey to whip your music's metadata into shape, but TagScanner looks like a solid alternative. TagScanner is a free download for Windows only.

TagScanner

Blogger and information junkie Steve Rubel details how he uses Gmail as a taggable, searchable knowledge base using previously mentioned tricks and tools like Gmail plus addresses, the Ubiquity Firefox extension, and Gmail Labs Quick Links. It's a fantastic system, not only because it works perfectly with apps you already live in (namely Gmail), but also because you can save and tag an entire web page in a few keystrokes. Likewise, you can access the information quickly and easily with Gmail's excellent search. I recently detailed how you can expand your brain with Evernote, a free, cross-platform note-taking application, but if you live and breath Gmail, Rubel's methods (which improve on similar Gmail solutions we've seen before) are worth a try. Make Magic with Metadata in Gmail

Google's Picasa is seeing updates on both the web- and desktop-based versions of the popular photo management application. The biggest new feature is coming to Picasa Web Albums in the form of people tagging, a Facebook-style tool that lets you tag faces in your photos by name and then view pictures of that person by simply searching. The difference between this and Facebook is that Google identifies all of the faces in your pictures automatically and groups together the faces that it thinks are the same, making people tagging extremely quick and easy to do. According to technology web site CNET, Google will also be releasing a new beta version of Picasa for the desktop today, the main improvements to which include a movie maker and online synchronisation of every edit of a photo. The download isn't showing up for me yet, but people tagging is live, so give it a try and let's hear what you think in the comments.

Picasa Web Albums

Web utility del.icio.us to Firefox merges your bookmarks from social bookmarking web site del.icio.us—tags and all—with your existing Firefox 3 bookmarks. Why might you want to do this? Because the new and improved bookmarking functionality in Firefox 3 supports tagging, but since previous versions of Firefox did not, you've already got tons of bookmarks with no tags.

Now that you know how to stitch together panoramic photos with free software, publish your creations at Panoye, a panoramic sharing web site. Panoye users are building "a virtual tour all around Earth" with user-submitted panoramic images. Upload, tag, geotag, and share your panoramas on Panoye, which offers YouTube-like HTML markup to embed a pannable panoramic image onto your own web site, like the one after the jump:

Blogger Dennis Best, who previously schooled us about the value of built-in Getting Things Done apps, expands on his all-inside-the-Mac thinking by noting a simple way to organise every email message, document, iCal event, or other file. Add the ° character (Shift-Option-8 on Mac keyboards) directly in front of any word you want to track with, and both Spotlight (and, of course, Quicksilver) can quickly catch and sort your keywords for you. Guest poster Nick Santilli suggested a similar metada system using the "&" character, but Dennis' idea tags files by adding only a single, non-intrusive step you can do right inside the text. How to tag nearly anything anywhere in Leopard