I reinstalled 2.0.3 from the website, and I'm still seeing the hangs as well. Not as often, but still occurs.
Steps to reproduce: 1) Use keyboard shortcut to take a screenshot. Skitch window comes up. 2) Close window with Cmd-W 3) Keyboard shortcut no longer works, Skitch window has empty middle area, and Cmd-Q hangs. Amazingly frustrating. Quitting Skitch after each screenshot, or hiding the window with Cmd-H works works fine.