Great post by Coda Hale on simplifying posts to Twitter: doing it via Quicksilver.
Had to follow a comment from Michael Janssen:
I had to change:set twitter_key to first Internet key of current keychain whose server is "twitter.com"
toset twitter_key to first generic key of current keychain whose name is "Twitterrific"
in order to get it to work, because my twitter key is just a regular aplication password.
UPDATE:: Thanks to Ted Leung, now working with Growl. Make sure to apply the code above again if you have the same issues as me.

So you’re twittering now?
oh yes. Join me, Wedge.