iPhone iOS 4 & 5 upgrade – restore lost pictures in camera roll
update 10/21/2011 - it appears that this bug has come up again with a number of people who have updated to iOS 5. luckily, the solution is the same as before. i have updated the instructions to help with any changes that iOS 5 added. before you start - this will only work if your photos actually exist on your device but do not show up in in the camera roll....