Skype me
After playing around with the final version of Skype 2.0, I think I'm going to make it my main IM client, at least on my laptop.
First, it seems to manage memory much better than Yahoo At idle, Skype uses 4-5 megs, vs. 19 or more for Yahoo -- and once Yahoo needs more memory for a higher-end feature , it never seems to give it back up when it's done. Adding IM environments, animated gestures, Yahoo Music integration adds up.
Skype's voice calling features are still the best among the IM clients I've tried -- though I haven't played around with Google Talk's voice features yet. Being able to forward calls to regular phones and having a version for Pocket PCs are really handy features. Video conferencing (at least for Windows) just clinches the deal.
The one downside, of course, is that most of my friends are on Yahoo. If only someone made a Yahoo plugin for Skype...