Dave Winer, who developed one of the standards which podcasting is based on, is excited by the idea of combining audio files with Twitter messages. He calls the combination a “TwitterGram”:

The other day I was thinking about other kinds of Twitters. The thing we like about Twitter is that you can’t post a book-length story about what’s going on right now, you can only do a 140-character synopsis — “I just got on BART” or “Driving to NoobCamp.” It’s one of those Worse Is Better or Less Is More things we like so much about the Internet. So I started making a list of different kinds of Twitter, and immediately gravitated to something I call TwitterGram, where you use the 140 characters to link to a 200K audio message. Think of it as Twitter meets podcasting.

This seems like it could be a good idea to pair with mobilecasting.

Give his message a listen (below) and let him know what you think at his site.