Upload pictures of any format to TwitPic.com by just dragging it to the dock. Integrated (optional) tweeting with a custom message. No need to keep the app running.
TwitPic lets you share photos on Twitter. It let's you upload pics to TwitPic servers and optionally share them on your Twitter stream. However, this app goes a step ahead in one aspect, whereby it lets you upload almost any major image format, rather than TwitPic's only supported GIF, PNG and JPG. It uploads the image in PNG format, while also retaining the original quality.
The application is handy enough to be kept in dock (if not already cluttered :P ). And without opening it, you can anytime drag the image you want to upload, into the application's dock icon; wait a second while it uploads, and tada! the image has been uploaded and the link to the twitpic.com URL for the image has been copied to your pasteboard (clipboard).
If you supply a comment for the upload, a link to the image along with the comment is posted as a tweet on your twitter stream as well. Good enough even for normal image sharing, where you don't want the image to be posted to your twitter account.