I love my Puigpull:

http://www.rosehillwinecellars.com/3...ils.php?id=830

In terms of size and heft it closely resembles a waiter's corkscrew, but has a sort of ratchet device. You flip open the screw part, twist it in, flip the handle up and put the notch on top of the bottle (just like a waiter's corkscrew). Then comes the fun part, you flip up the handle and work it like a ratchet and the cork lifts right out.

We saw this in use at Vini di Gigio in Venice, and loved it so much that the waiter sold us one. Once you get some experience it is really quick, and I like that it is a very manual operation.