I have to say, I love how they finally got the "combining buddies" thing right. When you group somebody together, they are effectively the same person. It uses the same window, you can search the combined history, and it's really easy to change which screenname you use to send to them (it's under a menu). In all previous versions of Gaim, I found that grouping buddies didn't really work properly, and felt buggy.
And on a sidenote, gaim-encryption3-beta2 has been released, which fixes a crashing bug (that me and Newby apparently found)