Is there any way that images could be uploaded live to the internet? That way, no matter what happens to the camera, the pictures are already out there.
I have two digital cameras so I could risk one, and I've got my old laptop that's on it's last legs but still servicible. I could throw pics up on my FTP server and give someone access to post them, but I think the hard part will be finding internet access during the melee.
Another good strategy in threatening environments is basically posting lookouts. In contact by cell, have numbers for authorities handy, able to contact backup witnesses quickly. We had to do this during the 2000 election protests. Getting a sympathetic radio personality to do live broadcasts is great exposure and assures a certain police presence. We also had livecam internet. (But you'd need a technogeek for that!)
See post #86. Camera phones.