Channel 4 was suggesting that one way to get to work during the convention was to use a bike. I think this is a great idea, but I don't suggest going in groups.
As far as today's march goes - I admit that I'm nervous about this. Streets and avenues around the march site have already been locked up tight. The Garden itself is a fortress with a moat of barricades, communication trucks, and God only knows what else. This is the big test for both the city and the police. On top of all that, it is going to be typical end-of-August sticky New York day.
As far as photography goes - it is going to be tricky. If you go in with the march, you get stuck in one spot in the great river. Whether you can get to the sidelines or not - that is the question, and honestly, it's where I'd rather be since you can move around more freely.
What makes me nervous is a) what is going to happen when the march reaches the turnaround spot? And b) it only takes a couple of provocateurs to turn this into a bloody nightmare.