Animania has something called the hamster wheel. Pick up your furry hamster friend, (shift-right-click) and then right-click the hamster wheel. it can also generate Redstone Flux for your machines from other mods. The hamster will continue to run, generating 20 RF/tick, until it is hungry, at which point it will leave the hamster wheel. It can remain in the wheel indefinitely if supplied with hamster food, which can be inserted using a right click, hoppers or pipes from other mods. The wheel has an internal capacity of 16 hamster food and 200,000 RF.