Axiom 1: my mail user agent is running on this machine.

Axiom 2: I use my browser or another standalone app to see my twitter friends' timeline. I use same app to twit myself.

Question 1: why the hell do I have two different applications for MESSAGES ?

Solution: I want a "conduit" as an extension for Thunderbird or Postbox, or even as a builtin feature, that takes my friends' timeline and turns it into a mailbox. I want my twits to be composable from within my mail user agent (including image attachments), sent to twitter instead of a smtp MTA, my attachments sent to twitpic, my geolocation sent to whatever. I don't want an email-2-twitter gateway. I want twitter in my MUA.