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VisualTwitter is the latest to build on the Twitter API. With this tool you quite simply send an image to your Twitter updates by sending it to [email protected]. You'll need to give VisualTwitter your phone number for validation purposes. You can sign in with your Twitter information. From there, everything is very straight forward. There's not much community on VisualTwitter's own website--there's really no need. You can, however, see the photo stream for users listed on the site. The service plain and simply lets you send images to your Twitter page. My only concern is their use of Twitter's logo with their own. Questionable?
Other Twitter image services and clones include MobyPicture and Yappd.