I'm with this on you Dave Winer, I'd like to see more data formats "native" to Twitter too.
Pictures, audio, and video are my top three requests. As to whether these formats are not SMS friendly, all I can say is the world is migrating to richer data types already.
Of particular interest to me, if twitter supported pictures I could easily create an inkable front end to Twitter in which I could share graffiti messages with my friends. I'd love it. Currently the only way to do this--that I know of--is through MSN Messenger, however, inked drawing can't be viewed on non-Windows platforms. This would be a way we could get around that limitation.


Incremental Blogger