I'm using X.0.4. Gonna upgrade in the near futre. IE crashes all the time. AIM for MacOS X crashes occaisionally, but my main beef with it is that it isn't as full featured as the old Mac client. Hopefully this will soon change. The big thing though is that as often as all those applications have crashed (since most everything for OS X is in Beta still) is that the system has not gone down once.

Here, dig a screen shot:
http://fm.redrival.com/macboy/misc/screen.jpg