PowerLock is a Cydia application that lets you view and open applications from the locked screen. To get it there you have to:
1. Enter Cydia.
2. Search PowerLock.
3. Download the application.
4. Enter to “Settings” in the iPod.
5. Click “PowerLock”.
6. Start PowerLock.
It costs $ 1.49 (€ 1.03) and is quite useful to access applications without having to unlock the iPod.