Threeter is a desktop application for Windows that lets you post tweets at the press of a hotkey. Once you install the Threeter software, just configure your account and set a hotkey combination.
After you’ve configured the app, just press the hotkey and a translucent window pops up top of all other windows. You can type your status message here and press â€˜Enter’ to tweet it to your account.
I guess this is probably the quickest way to post messages to Twitter from Windows (other than TwitterBar for Firefox I guess). What do you think?