DesktopTweet

DesktopTweet is a small program that lets you quickly take snapshots of your computer's screen, and then tweet them up to Twitter quickly.

With this program all you need to do is highlight the region of the screen you want to snap, write a quick tweet for it, and then DesktopTweet will handle the rest, uploading it to an online Twitter picture service of your choice. DesktopTweet is a program for Windows.