Chat details are on this page. I sent an invite for the chat to a number of IBMers and judging from the positive responses, we should have some good IBM representation (Software Group and IGS) on the call besides myself. But remember this chat is open to everyone so please join if you're interested in Ajax in whatever capacity (novice to expert).
Please remember to get an IBM ID if you don't already have one (it takes 2 minutes).
If you plan on joining, join a little early (12:50 EST / 5:50 GMT) in case you have any setup difficulties. In case you need help, non-IBMers can IM me at 'wph110' on AOL IM; IBMers can IM me at 'firstname.lastname@example.org' on Sametime.
Update: I've gotten a few questions on the format of the chat. It will be a text chat (like IRC), not a voice chat. Naturally the chat client is an Ajax app (what were you expecting... an Applet?!)