Twitpic

Twitpic is an excellent tool for posting and sharing photos via Twitter. Since Twitter is just text and links, an easy-to-use photo element enlivens the experience considerably. Users can use Twitpic to post photos to Twitter from their Website (using the Twitpic API), from their phone, or from the Twitpic site.

There are many other Twitter picture applications out there, but Twitpic is often the easiest and most reliable to use.