Twizzlescape
Twizzlescape is a web-app. Which is just like a regular desktop application, only it runs within your web browser, so theres no need to install anything and you're always using the latest version.
Twizzlescape's main function is to use the twitter service, as an alternative to using the official twitter.com site, Twizzlescape presents your tweets in a more animated way, and as tweets arrive they bounce onto the screen, no need to click refresh.
Twitter is only one part of Twizzlescape, it also provides you with customised News and Weather, and integrates them too. For instance, if you see a news story, a couple of clicks and you can tweet about it to your followers, no copy/pasting required.
Twizzlescape also provides more interesting content along side your tweets, such as Digg items, YouTube Videos, live Justin.TV feeds, Second Life events and even has a mini-Satscape (satellite tracking software) build right in. All these panels are optional of course, so you can customise it with the content you want, swap the panels around and easily navigate between all the content you want.
Want to see what Twizzlescape has to offer without logging in? Have a look at this screenshot showing a wide selection of the panels available.
All you need is a twitter account to get started, Twizzlescape will link to your twitter account (with your permission) to provide you with a richer and funner (is that a word?) Twitter experience