Gush is a free, professional grade, cross-platform, instant messenger and newsreader contained in an aesthetically pleasing environment. Gush prides itself on being secure, full featured, and yet simple. Some people say its drop dead gorgeous but we're a bit more modest.
Gush's support for the PubSub service is very exciting especially for news junkies eager to find information lying around in RSS/Atom feeds. With support for PubSub built into Gush, search queries can be constructed and news items will come pouring in near-real time as PubSub discovers new items in RSS/Atom land.