LSrotator

LSRotator lets your iPhone's/iPod's lockscreen rotate according to your device's orientation when you flip your device (like an iPad).

Following SBRotator, this tweak comes now to fill the gap and lets you use your device in landscape at the lockscreen too.

You can lock orientation if you wish, by simply tapping the lockscreen with 2 fingers.

Rotation duration, orientation angles and graphical options are available under settings.

This app is available in Cydia (jailbroken devices only).