Snapost
Snapost allows users to use images taken from their camera or photo gallery and post them to TwitPic, simultaneously updating their Twitter stream. Currently this application is optimized for iPhone, but with minimal changes it can be modified to run on Android as well.
More Information
If you'd like to learn more about Titanium Mobile, head out to http://appcelerator.com. For API documentation and tutorials, head over to http://codestrong.com.