If you are a Quicksilver user and a Twitter-er you really need to give iQuickTwitter a test drive.

This little script has it all:

Counts characters and notifies you by Growl if you exceed 140.
Notifies you by Growl when your tweet is sent.
Twitter username/password is hard coded to avoid Keychain Access and reduce delays.
Checks to see if iChat is running and then sets your status message as the current tweet.
Checks to see if Skype is running and then sets your mood text message as the current tweet. Note: If you want to integrate Skype mood text updates, open the script in Script Editor and uncomment (remove “–”) the Skype tell.
Growl will use the icon of Twitterific if installed.

It’s really simple. All you need to do is call up Quicksilver, type in your Tweet, hit tab and fire off iQuickTwitter and wait for Growl to notify you that your Tweet was successfully posted. Quick, simple, and easy.