With "Youth in Revolt" now in theaters, maybe it's time to start taking stock of Ann Arbor's burgeoning feature-film industry. While quite a few high-profile movies that have shot scenes in Ann Arbor have yet to be released (including "Betty Anne Waters" with Hilary Swank, "Stone" with Robert DeNiro, "Cedar Rapids" with Ed Helms and "Trust" with Clive Owen), four have hit the screens already (if you count straight-to-DVD "American Virgin"). So let's ask ...