top 5 in no particular order:
1. Internalizer - Because it allows me to leave my contact details on the lockscreen (Incase i get drunk and leave the Ipad somewhere)
2. KillBackground - Becuase my son will leave 20,000 apps open and i can turn them all off at once
3. ManualCorrect Pro. Becuase the auto-correct absolutley sucks and i keep sending mails that have been auto-corrected to complete jibberish
4. Activator. Because i use gestures as shortcuts alot. This may not be the best app option for this so open to suggestions
5. AndroidlockXT. Becuase its make your lockscreen look quite tolerable.