Mobile dialogue and announcements - GuerrillaTweets

Hi all,
I just recently discovered DIYcity and am fascinated by the forward-thinking nature of this endeavor. As a planner and web developer it's right up my alley.

We have recently been kicking around some ideas about how to truly mobilize Twitter, to use it outside, on streets, in parks and in venues - accessible for anyone, not just the Twitter "elite". Beyond some of the obvious uses of Twitter, it's a great exchange format, merging information from both humans and machines in a very straightforward way.
Anyways, I don't want to go into much detail, since that's probably all old news for everyone here. We have put together a prototype that basically allows anyone to request the most recent tweets and link to more via text message. It works for both, Twitter accounts and hashtags, and anyone can post to hashtags via text message, if they are not on Twitter. In addition, we're playing with various sticker formats, to encourage interaction outside, on site. And that's where DIYcity comes in.
We'd love to brainstorm and test some use cases and some of the ideas discussed here seem perfect. As a start, some of our ideas include:

- Mobile dialogue in parks, squares, etc.: Use a hashtag as "discussion forum", to post safety issues ("6'5, bald guy with green shirt just stole my purse"), to fun stuff ("Need 2 more players for our volleyball game, come to xyz"), weather alerts, lost and found, etc.
- Mobilize announcements from delays, to parking spots (http://twitter.com/BoulderParking), to city infos (http://twitter.com/iknowdenver) and make them accessible beyond Twitter's user base.
- More advanced concepts of the mobile city (http://www.planetizen.com/node/39717)... again, going beyond the Twitter user base.
As I said, we have a prototype to play with at http://GuerrillaTweets.com and would love to get feedback, discuss the concept and assumptions and hopefully get some of you interested to play with it or collaborate.

Cheers,
Chris

http://eParticipation.com
http://twitter.com/challer