BeeJive has just released an alpha of JiveTalk for iPhone – a web-based mutli-network IM client that allows you to chat on AIM, GTalk/Jabber, MSN, and Yahoo simultaneously. It works much better than Meebo and uses an iChat style bubble display. I tested connections on AIM, GTalk, and MSN and all worked without a hitch.
Point your iPhone to iphone.beejive.com . They seem to be able to detect twhether the connection request is coming from an iPhone as I was unable to get the service to load in Safari on the MacBook.
H/T to TUAW.