check out the digitech whammy here

Mine is an indispensible part of my rig, and you can do all kinds of cool stuff. It has loads of settings and you have to play around with them a bit, but you can get way more extreme results from the pedal than you would from the trem. The new model has a 'dive-bomb' preset, but you can also raise pitch way further than you could with any kind of trem and can also harmonise at different intervals.

Other than being a pedal, the Whammy isn't much like a wah at all...