That's a very handy gesture. Unfortunately, up until this point, the only multi-touch I use is two fingers to scroll the page and two fingers plus click for right-click. The same stuff I used with my PowerBook in fact.

I just haven't gotten used to the other stuff to use it much. I can't stand the pinch for zooming nor the two finger rotate in the apps that implement them. Too touchy and impossible to easily set the views back to their defaults. In Photoshop this is really problematic. In Safari and Mail it's just asinine - especially in Mail since there's no "100%" or "default" view to get back to in any way shape or form. I'm running a hack to disable the zoom in both those apps.