TweetDeck

If you're nuts for the popular social networking and micro-blogging service Twitter, then you've quickly outgrown writing and tracking tweets using Twitter's Web interface. TweekDeck is a free desktop application that puts Twitter on steroids, letting you easily track any search terms, group your followers, shrink unwieldy URLs, and more--all from one centralized window.

Note: This link takes you to the vendor's site, where you can install the latest version of the software (and Adobe Air, if you don't have it) directly onto your PC.

--Adam Pash