Regarding the UltraClamp, it is very versatile. But I found it isn't very robust. It failed to securely hold a single AKG C414B-XLS + shockmount, so I ultimately gave up on it and stuck with the Windtech. YMMV.
Regarding the SuperClamp - great clamp, but I find it a bit bulky and heavy for stand-clamping. But for clamping to most other objects, it's great.
Someone also fairly recently pointed out a knock-off of the previously popular Rowi, but I don't remember where, exactly.