I had a funny experience at the Apple Store yesterday. I took my digital AV adapter in for an exchange, the genius asked for my iphone claiming he needed to do a test to make sure the problem is not my iphone, so I handed him my iphone4. Very swiftly, he flipped to Soptlight page and very quickly he typed in the c and y characters, sure enough cydia didn't show up because the night before I took it in, I completely restored my iphone back to the non-jailbroken fw just to avoid something like this. How sneaky of Apple huh! Haha, I guess I beat the genius!! Next time before I bring it in, I am going to make myself a bogus app called Cythia with the cydia icon just to see what reaction I will get.