Yes. When the button is tapped, it should start recording audio and streaming it to a public (or private) web location. Maybe video too. Make sure that if the cops arrest a group and take all their cameras, audio and video are not lost.
This needs to be made (maybe I'll start this weekend).
The qik app nicely allows you to record video to an account which you cannot delete it from the phone, but must use the web interface (in case your phone is captured).
That's not completely true. There is the ability to easily delete uploaded videos from your phone.
Qik is still my solution for this sort of thing. If you record, it immediately starts uploading. Even if you randomly close the app (by pushing the home button), it finishes the upload in the background. This makes detection difficult for the un-savvy observer.
If you're going to do this, add the ability to retro-record (i.e. when you press the record button, the recording starts from 30 seconds in the past - meaning that you'd have to record continuously and have the 30 seconds on a cache at any given time).
Retro-record is a great way of putting it but I think a phone app doesn't really need retro-record even in this case. However, phone integration with lookxie (http://looxcie.com/) might be interesting.
This needs to be made (maybe I'll start this weekend).