Talking Google Talk
Just by-the-by, I've been using Google Talk and it sounds as good as any Skype call I have ever made. I have encountered a little jitter now and again, but during one 90-minute call, the quality was consistently good throughout.
UPDATE AT 3:55 pm: There I was singing Google's praises, but now Gmail seems to be suffering some major outage. I've been getting server error messages for nearly two hours now.
UPDATE 2: Several people have asked, so I will clarify - the outage was in Gmail only - Google Talk continued to function beautifully.