Dave Winer of RSS fame has introduced the TwitterGram and a TwitterGram web service, which lets you send 200K MP3 sound files instead of text messages.
For more details, go here -- Winer's Scripting News Annex. You can listen to a few TwitterGrams at http://m.twittergram.com/.
Tom Simonite, an online technology reporter at New Scientist, wrote about this last Monday in Twitter ye not. Comments to this post point to similar features at Odeo and PodGlo, but these are not Twitter-related: I think you're much more likely to succeed if you extend a popular service than if you have to start a new one. Otherwise I tend to agree with the comment from Michael Clarke: "It'll take off when you can just phone in your message" instead of having to record and upload an MP3 file.
Guess what: in Phone-to-twittergram breakthrough!, Winer says "Roger Strickland has a bare-bones phone to Twittergram system working. I just called his service on my Blackberry, recorded a Twittergram, and it was posted through the web service. Yehi!!" Other people are working on the same idea.
