Still digging about, found that one of my old favorites has been killed for a couple years by big business buyout. Found one called meebo that doesn't actually require a download. You can go right to meebo - online web IM for AIM, MSN, Yahoo, Google Talk messengers and sign in to the various chat messengers and chat right from their site. There is also a Firefox extension that docks it into the browser. I haven't had the chance to play around yet, but it sounds interesting if its compatible with FF3. Anyone try meebo out?