As an avid MacVim user, I'm really interested in people pushing the graphical vim experience on Mac OS X.
I find it interesting that you included a fuzzy quick-open. One of the pain points with CtrlP in a large project - even with fast hardware - is the synchronous building of its filesystem cache. I would be interested in trying another implementation that lives inside of an app (where it can be dispatched asynchronously).
All in all, a nice looking app! I'm interested in giving it a shot!