If you're a fan of Tweetdeck on your iOS or Android device, or even the desktop Adobe AIR version, you have until May to say goodbye.

Windows/Mac/Linux (AIR): JamCloud is a free social music app that lets you "DJ" videos and playlists from YouTube and SoundCloud.

Windows/Mac/Linux: Google Reader is great for funnelling news into a digestible, easy-to-read format, but it's not very attractive. Readefine Desktop is a desktop reader that connects to Google Reader or any RSS feed you provide and displays your articles in a beautiful magazine-style layout.

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Windows (AIR 2.0): HandBrake is our favourite media converter and DVD ripping tool. DropFolders automates HandBrake slightly, having it watch a folder, convert what it finds and drop it wherever you'd like.

Windows/Mac/Linux (Adobe AIR): Free Adobe AIR application Bulkr downloads all the photos from a user's Flickr stream, a search result or even backs up your own Flickr photos using the highest quality version available.

Windows/Mac/Linux (Adobe AIR): The marquee features added to social network aggregator TweetDeck are Google Buzz and Foursquare support, plus scheduled updates. What's actually useful, though, are the global filters that weed out oversharing, spam and other annoyances.

Windows/Mac/Linux: NoteSync is a lightweight application that allows you to manage notes easily, and offers two-way sync with Google Docs to keep your notes updated and always accessible.

Adobe Air (Window/Mac/Linux): toDoo is a streamlined Adobe Air-based task manager with an emphasis on quick task entry, updating and surveying of pending and completed tasks — both successes and failures.

Adobe Air: Streaming radio stations abound but finding them is one thing and enjoying thousands of them with a polished interface and all in one place is another. Antenna is a sleek Adobe Air-based radio tool that makes streaming radio fun.

Windows/Mac/Linux (with Adobe Air): TweetDeck — the most popular Twitter client among Lifehacker readers — just released an update to version 0.33, bringing with it more support for viewing media inline without opening a page in your browser (including YouTube videos and Flickr images) and a nice new column navigation tool.

Windows/Mac/Linux (AIR): It's always fun to throw a party and let your guests get goofy with a camera. Free photo app Party Booth creates photo-booth-style picture strips from a webcam, and can automatically upload them to Facebook, Twitter or other services.

Adobe Air: There's plenty of standlone Twitter clients, but Facebook options are less common. SocialVisor combines both in a single Adobe AIR client to let you keep an eye on your social networks without too much productivity disruption.

Windows/Mac/Linux (AIR): Say what you will about newspapers, but the old grey ladies are laid out for quick reading. Cross-platform app (and web app) Readefine breaks any site or feed into column-split articles and easy access jumps to other posts.

Windows/Mac (Adobe AIR): Desktop widget application Snippage displays snipped portions of web pages as widgets on your desktop, so you can keep your eye on your to-do list, email or anything you'd like.

Adobe AIR: Note-taking application Scribbly lives in your system tray and lets you quickly write notes or reminders to yourself, and then will email them to you with a single click.

Windows/Mac/Linux: Popular desktop Twitter client TweetDeck just released an update boasting support for a few of Twitter's new features—including lists, geolocation and retweets—along with support for career-oriented social networking site LinkedIn.

Windows/Mac/Linux: Adobe is offering up a "prerelease" of its inescapable Flash software, adding in GPU acceleration for H.264 video in Windows, multitouch support and bug fixes. Anyone with Adobe AIR apps can also grab a 2.0 prerelease of that platform.

Windows/Mac/Linux (Adobe AIR): We've written about a lot of desktop clients that are essentially site-specific browsers (SSBs), but free AIR client Google Tasks helps you consolidate your clients by allowing access to most Google apps in mobile form.

Adobe Air: If you're looking to put a flourish or two on an invitation, business card or web page, Livebrush makes it super simple to create your own designs without purchasing advanced vector-based software.