Remember how Messenger used to be so popular only a few years back? Now it seems most people prefer to chat with friends on social networks like Facebook. Not only can you much more things, but most of them also include a built chat tool, that replaces the need for an IM client.
Gabtastik is a site specific browser (SSB) built so you can use these online chat services in a separate window. To translate: Gabtastik lets you use online chat services just like if they were separate applications.
The interface is clean and Gabtastik lets you open up multiple chats in multiple tabs. So far it only works with Google Talk, Facebook Chat and meebo. If you use an iPhone you'll probably be interested in learning that it also handles the Hahlo iPhone Twitter webapp.
Gabtastik uses very little RAM and its nice having all these online chat services in a separate window, instead of hidden away between various tabs of your browser. Obviously it's only limited to certain services, but if you use meebo, you'll have access to many more like MSN or ICQ.
Gabtastik lets you use online chat services in your very own browser window.