There are some misconceptions floating around about the 2100, the c-700, and the c-720...
First of all, the 2100 has image stabilization, which the other two don't. The c-700 has auto white balance which the 2100 does not have, a higher maximum iso level, and a longer possible shutter speed. The c-700 also will not weigh you down nearly as much as the 2100, which is a monstrous camera. Also, the c-700 has a much better color saturation as opposed to th 2100, giving a more accurate picture.
The c-720 is a 3 mp camera, but with only an 8x optical zoom on it. Also, several of the manual features have been raped from it, and from what I've heard from users, at this point eiher the 2100 or c-700 will consitently take BETTER pictures then this. I'm sure Olympus will fix this with firmware updates, but you never know, it might just be a stinker.