[WTSand]

The Gerber "Gator" is the easiest to learn the "start with the thumb and flip of the wrist" method. The "old reliable" Buck knife works well too but takes a little more practice.

[bvw]

Thanks also.

[Hypervigilant]

I have some of these Kershaw Spring Assist knives:

http://www.bladehq.com/item--Kershaw-Avalanche-Spring--144

Easy one-hand operation.