Trillian Astra
I've been using Trillian for a while now. It is a great instant messaging program. It combines all the major IM clients in one, AIM, MSN, Yahoo, IRC, Jabber (and Gtalk) and more. The only complaint I've ever had with it is that it has been a bit heavy on resource usage. That doesn't bother me anymore because if I used all the alternatives I'd be using way more resources. I do use AIM, MSN, and Yahoo so that would be three IM clients open and running. My computer couldn't handle that with all the other things I have going, especially since the new AIM and Windows Live Messenger have become bloated pieces of crap. Yahoo is the least bloated of those but I feel like a 12 year old when I use it because it has all these stupid kid-friendly features and icons.
Anyway, enough with my rant. The real reason I was writing this post is because there will be a new Trillian coming out soon named Trillian Astra. I've not used it yet, though I am signed up to be a tester whenever they draw more names and add more testers. This program looks very promising. Astra will have faster loading times, improved memory usage and memory leaks plugged, widgets, a web interface to stay connected when you are away from your computer, and overall interface changes. I can't wait for this program to come out.