I have the same problem, which started occurring after the last update. I'm on an original iPad running iOS 5.0.1. The crash occurs while starting to restart a game after I've left it in the middle. It's happened three times, including in the midst of my best game ever.
I have a crash file, captured on my Mac, in ~/Library/Logs/CrashReporter/MobileDevices/[name of my iPad]. I can mail it somewhere if that would help.