An old friend of mine from Argentina contacted me recently and showed off his work. I was impressed.
6kbytes.com integrates all your messenger accounts (MSN, Yahoo!, ICQ, IRC) into one slick Flash 8 interface. And it’s all free.
As far as i understood, communication is done via XMLSockets to a Jabber server that is used as a gateway to other messaging servers/protocols.
Good job, Francisco!