The other problem I have is that some of my friends use Twitter, some use Plurk and some use Facebook and I can't convince them all to use the same service. If I would like all of them see my updates on their favorite sites, I figure what I need is a service that help me post status to these sites and it's better through one single entry point, for instance, from Google Talk. Well, I choose Ping.fm. Also, HelloText is possible for you. Ping.fm gives you a Gtalk robot to talk to and everything you talk to that robot will be posted to your preferred sites.
Anyway, my flow looks like,