Everyone is talking about it
I tried it and the part I like is the integration within Jabber. Simply add your jabber ID to your twitter profile and send it the passkey you receive on your twitter profile. From that moment on you can simply message the twitter bot contact and it is automatically posted.
I still don't really get the main reason behind it, but I'm a web 2.0 whore, so trying won't hurt ;)
UPDATE: ok.. boooooring :P I still don't get why I should tell other people what I'm doing atm. Bye twitter