Yes. "Wood & Stones" is a "Goban" for playing Go face to face with a friend on an iPad:

http://github.com/raganwald/wood_and_stones

I'm not even a novice player, so in addition to supporting Classic Go, Wood & Stones supports a number of Go variations that offer some learning benefit.

You can try it on Github Pages:

http://raganwald.github.com/wood_and_stones

It's based on jQuery, jQTouch, iGesture, and JQuery Combinators.