If you’re on Linux, and looking for an IM client that’s lighter than Pidgin, check out Empathy. It only uses about 23M of memory, plus about 15-20M for the background transport services. It has tabbed chat windows, notifications (via Gnome Notification), etc. It’s also one of the only clients that supports Voice Chat through Google Talk.
Overall, I give it a 4 out of 5.
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