AIM 5.5, released last week supports video IM, and of course is compatible with iChat AV. I mentioned when iChat (and it became explicitly clear when iChatAV was released) that this was AOL’s way of skirting around the FCC concession they made during the TW/AOL merger requiring interoperability with competing instant messenger tools. It seems to me that in this sense Apple has become the default Judas of the computer industry (MS: see, we have competition! [here’s some cash and Office]; RIAA: see, we’re offering music! [go sell some iPods]; AOL: see, we’re interoperable!)
(BTW, the mess that is SIMPLE doesn’t bother me so much. XMPP is moving forward, both in IETF-space, and more importantly, in the market: Gush, XIFF, SoapBox, Jive. I’m pretty confident that the next-generation social networks will subsume and make irrelevant proprietary services. In a decade, we’ll hopefully look upon AIM, MSN, and its ilk just as we do with CompuServe and Prodigy mail today)