Livejournal just released a new service called LJ Talk. Similar to Google Talk they are using the jabber protocol (an open source based IM protocol), and they have a bunch of goodies about this up at http://www.livejournal.com/chat/
I kinda like this idea, mostly because you can post to your LJ by IMing Fank the Goat, and because Trillian and GAIM already support Jabber-based stuff, so I can talk to all of you from my computer. (if you check out GAIM, download the 2.0 beta 3, it is pretty stable and it supports more good features)
Next it would be great to see a web-based interface for this, similar to Gmail’s built-in web-based IM, right on your LJ page, or friends page.
Anyway, that is a little announcement, check it out if you get the chance.