I just built a couple Twitter-viewer plugins using flash-- you can put in any @name and it will display the last five twitters from that name:
http://emaqdesign.com/video_loops_flash.html
You can change font size, style, tracking and leading as well.
If you're looking to have an SMS to resolume feed and you like writing PHP, you can always build a SMS reader in PHP that will spit out a properly formatted XML file that you can pass to REZ. It's not as convenient as using the Twitter API, but SMS is kind of nice to use because it's so universal.
Next stop-- build one that allows you to search ALL tweets for a certain subject, name, etc!