This is one of the more useful tweaks that has been released in the past couple weeks. LockSliderz is available in Cydia, and will allow you add up to 2 sliders with a left and right action. With one being assigned to just unlock your iPad as normal, you have the ability to add 3 apps to launch directly from the lockscreen.
LockSliderz is available for $1.49 from the Cydia store. Video demo to follow.