Thanks for all the replies. If Thursday runs true to form then I don't think I need to be too concerned about personal safety - yeah naturally I'll watch my ass etc, but in the location it tends to take place there's plenty of room to get out the way, and having been there last year I have a fair idea of how it'll play out
The Zürich riot tends to be more like a fast moving game of chess between the rioters and the Police. It's like it's a yearly sporting event that's watched by the locals. There never seems to be too much in the way of violence towards people (the Police come in for a bit of stick, but then the rioters come in for a bit of stick from the Police). Mostly its about damaging property as fast as possible (usual stuff - Luxury cars, windows of banks and global companies, Police vehicles etc) Possibly the most irritating thing is being near a tear gas canister when it goes off, but it's not as bad a people seem to think. Rubber bullets sting a bit as well - the guns spread the rubber shot like shotguns, so they're pretty indiscriminate.
I won't be in the dead center of the action - that would be asking for it - from both sides, but it's possible to follow very close and predict which way it's going to go by the positon of the Police blocks.
There is however something that may well wreck this little project. Rain is predicted for Thursday. The Zürich rioters appear to be a fair weather lot and if it rains there might be 10 rioters and 500 police. If this happens then the whole thing might be over before anybody's noticed it's begun.
I'll post the photos when I have them but be warned, I'm a beginner with a camera and framing is not my strong point - not that I'll have to much time to worry about that anyway - so the photos may be nothing to write home about. Constructive criticism will be galdly appreciated.
Cheers