Google Talk has released. I've been running it since last week and to be honest I'm not really sure what I think. It's a very simple UI, which in some respects is nice, but it's definately a beta product. In fact, I'd say this is by far the most beta of any Google beta thus far. I'm impressed at the call quality, but haven't had the opportunity to test it out with someone oversees. I'll post back my findings once I know more.