Wow, I'm on a roll here, two suggestions within an hour!
OK, another idea from me, just thought it up.
As we all know, Static boots were recently implemented into IC2. These boots, when equipped, will generate very small amounts of electricity when you run, this electricity will go into a Batpack or a Lappack if you have one equipped. So, I had the idea, what if this could be made into a form of generator?
And so I came up with the idea for Treadmills.
Treadmills could be blocks that generate a very small amount of EU when a player or a mob walks over it. If possible, treadmills could move in a certain direction (like a real one) if activated by redstone current. This means that if you run on the treadmill while its activated, you stay in place and generate a very small amount of EU. (I confess, I do want a pig-powered factory setup :P)
OK, that's all from me.
Please reply with your thoughts and suggestions!