Quoted from http://www.adiumx.com/

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The Adium Team is proud to present to you Adium X 0.54, a multiple protocol instant messaging client. This is a culmination of a year long rewrite of adium, which now utilizes libgaim (the core part of gaim) to connect to multiple protocols, and is also based on a new plugin architecture. Partial address book integration, cool looking tabs, multiple protocols for instant messaging, and a compact contact list are some of the many features of the new Adium X. Give it a try; we're sure you will like it.

Adium X is under active development. We have a lot planned, and we appreciate your support :)