Mac OS X Leopard only: Our favourite free virtual private network client for the Mac, HamachiX, has been updated (finally!) to work with Leopard. HamachiX is a graphical front end to the Windows Hamachi product, and essentially it lets you access your Mac remotely over the internet as if it were on the local network. That means you can listen to shared iTunes libraries, remote control your Mac, and access file shares as well. HamachiX isn't as easy to use or quite as stable as the Windows version, but it lets you network with PCs running the client as well. Here's how to create your own virtual private network with Hamachi.

Windows/Mac/Linux (all platforms): OpenOffice.org, the free office application suite, has released a beta of its 3.0 version to the public with a few key features rolled in. The biggest update is native support for Mac OS X platforms, meaning no need to install X11 packages on older Macs or switch to NeoOffice for a smoother experience (although NeoOffice plans to release a 3.0 of its own, so stay tuned). OpenOffice also adds built-in conversion filters for Office 2007/Mac Office 2008 files, a new "solver" function for spreadsheets, enhanced notes and viewing options in Writer, and other enticements for those willing to risk a few bugs. OpenOffice.org 3.0 beta is a free download for Windows, Mac OS X, and Linux systems.

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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.

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As Windows user, one of the strangest things about Mac OS is a running, active application can be in focus without any actual windows open. If you use Command+Tab to switch between apps and don't want to get stuck in no-open-window limbo, use the following key sequence to open a new window on your way there: Hold down Command+Tab, then press Option, then release Command. It doesn't work for all applications, but it does for Safari and Terminal at least.

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Blogger and remote-control enthusiast Tim Matheson, who previously showed us how to shut down Windows using a text message, posts a script and easy-to-follow guide for doing the same on a Mac. Everything needed for the hack comes included with OS X Leopard, except the cell phone, of course. Matheson suggests setting up a "super-secret" email address that you only use for shutdown messages, but there are other ways of remote-controlling a Mac using keywords. Hit the link to download a safe shutdown script, and post your own remote-control computing tricks in the comments.

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Mac OS X Leopard only: Reader Ben points out that there's a lot more to Mac OS X's built-in Dictionary than definitions. He writes in:

I just noticed that in Dictionary.app (at least in Leopard), under to "Go" menu, there is an option labelled "Front/Back Matter." Clicking this brings up a whole slew of useful reference material, including a language guide (complete with a list of clichés to avoid), a list of the chemical elements, and the text of the Constitution. Next time I'm on a place, I think I'm going to brush up on the Bill of Rights.

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Mac guy Rob Griffiths points out a few brand new command line utilities in Leopard, like the handy dot_clean command, which sweeps away Mac system files that start with a dot and annoy the hell out of you when you use that thumb drive on your PC. Griffiths writes:

Prior to 10.5, you had to manually delete them on the other system, or use Terminal trickery to remove them on the Mac prior to copying. As of 10.5, though, you can just use the dot_clean command on the directory in question. Type dot_clean /path/folder to join the dot-underscore files with their parent files. Read OS X 10.5's manual pages (man dot_clean) for more information.

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All-things-Mac web site Mac OS X Hints discusses how to automatically Quick Look certain files as soon as they're downloaded to your Downloads folder. The best approach from the thread involves setting your browser to automatically open certain file types (like your PDF or Word documents) with the Quick Look Droplet, a simple application that launches a Quick Look preview of whatever file it opens. Of course you could just set your browser to automatically open downloaded files with their default applications, but if you don't want to load up heavy software like Microsoft Word just to peek at the file's contents, this Quick Look Droplet might be a worthwhile solution.

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Mac OS X Leopard only: Free, open source application Secrets rolls every hidden feature of Leopard into an easy-to-use preference pane in your System Preferences. Developed by the author of the much-beloved Quicksilver, you can browse Secrets by application to see what tweaks are available for the apps you have installed. There's a ton to look into with Secrets, but the one secret that blew my mind off the bat was the "Arrows link to library instead of store" tweak in iTunes, which may be the most useful thing I've ever done to iTunes (and I've covered the best iTunes add-ons). Secrets is free, Mac OS X only. If you give it a try, share your favourite Secrets in the comments.

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Macworld's running a fantastic "Leopard Survival Guide" series, covering little-known Mac tips of all sorts, like how to customise the welcome text in a new Terminal window:

Open Terminal and enter cd /etc, press return, and then type sudo pico motd. That second command launches a text editor and loads a new file called motd (Message Of The Day). Type whatever you like for a message (for instance, "Welcome to the land where text is king"), press control-X (for Exit), press Y (for Yes, to save changes), and then press return (to accept the file name, which will be shown as motd). From now on, new Terminal windows will display your new greeting, right below the date and time of the last login.

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