A New tweak has just been released into Cydia that lets you specify certain apps to launch when your plug your iDevice into a power source. This tweak is called Plugged In and is really useful if you happen to have an iDevice dock. You see if you do have an iDevice dock, you can set for example the alarm app to always launch when you plug your iDevice in, thus making your iDevice a better alarm clock. While this isn’t the only use for the Plugged In tweak, you can see that this tweak can be used for many purposes.
If you are interested in the Plugged in tweak it is available through the Cydia store for a price of $1.99.