I've tried this trypod in a shop:

http://www.zipshottripod.com

I was impressed on how light it is and how quickly it opens. The idea is extremely simple and very effective, I think. Too bad it only holds 1.3 Kg. Several body+lens combination in the market will be too heavy, including mine (1.7Kg). I would have probably bought it, otherwise. Anybody owns one?