Quote
"When the cleaner wipes it out, it appears that the app has failed and deleted their data. And customers won’t know that it’s an iOS 5 behavior — they’ll understandably blame the app developers. Even though it’s not our fault, it’s certainly going to become our problem."
Cleaning… – Marco.org
I hope Apple gets this straightened out soon. I rely on the offline capabilities of my devices and they’ll lose much of that value in my eyes if I can’t reliably bring content with me everywhere.