Gmail and Google talk have been integrated. Now you can chat with people that are signed in to their Gmail accounts. You’ll get a chat box that looks like a chat window, except it’s all done in the Gmail webpage using AJAX.
Remember Meebo? If you don’t, it was an AJAX application that allowed users to chat over any of the four major IM networks. Looks like Gmail was the first of the four to do chat Meebo style. AOL has had AIM Express for a while, but they didn’t use AJAX. I bet Google’s AJAX chat will be much more successful.
I have some ideas as to why Google is doing this. More on that later.