adium is like the trillian of the mac world - the only issue i see with it is the incompatibility factors with other people using PCs and the actual messenger client and/or wanting to use the webcam features cross-platform. of course, these issues come up using the original messenger programs individually too so i'm still waiting on an all-in-one that addresses at least the 2 major platforms most users are on, let alone any UNIX based systems. 
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