TwitPic-It is a WordPress plugin that automatically uploads images to TwitPic.com when you add them to your WordPress blog Posts, Pages, or Media Library.
Use your Twitter username and password
Provides a checkbox on the Media Uploader that you can uncheck so you can skip uploading an image to Twitpic
(Optional) Automatically tweet your new images to Twitter
Works with any photo plugins that add images to the WordPress Media Library (e.g. PhotoSmash)
Keeps a record of the TwitPic URLs…go to the TwitPicIt settings page and view the log at bottom
Downlaod at: http://wordpress.org/extend/plugins/twitpic-it/