I am curious about USB 3.0. I think we don't have any USB 3.0 products in the market. So when we see USB 3.0 products like USB 3.0 flash drive or USB 3.0 camera ?

And which operating system supports it ? Can my Vista support USB 3.0 devices ? Is it supported in Linux also ?

USB 3.0 is a hardware.. so yes, Linux already supports it.. so does Vista.

you'll have to buy a new PC for it tough!