So, I will make this thread the Official BikeForums Thread on Electric Bikes.
Some popular systems are kits made by Wilderness Energy, Crystalyte and BionX.
These kits are quite complete, but you supply the bike.
Electric bikes are good for assisting you along in case you run out of glycogen fuel and so you can switch over to electric fuel, no option for fermented dinobone fuel.
Post up your make model of electric bike, maybe some stories, how often you ride, why you chose electric, what has it done for you, how do you like it, would you go a different route if you could go back, etc...
I am currently in the market for a kit. Probably not too expensive, maybe something like $500 tops. BionX looks sweet, but is kinda expensive.
By the way, are disc brakes necessary for this application? And if so, what is a good brand/model?