Guess what? I’m using Google’s “talk” IM service right now. It’s pretty simple, just added the server in iChat, used my google username and pass and now I’m using google’s jabber server (you can add me, email@example.com). Adding the account, I needed to try connect with and without SSL, and finally me online using their server. Here’s another HOW TO – Link. UPDATE: Get the Google client with VOIP and more here! Wow!
HOW TO use Google Talk (now) with iChat