Just a quick thought. Wouldn't it be cool if your trainer at home wasn't a fluid or magnetic trainer but one based on creating hydrogen? As you turn the pedals you create the current to split water into hydrogen and oxygen. I think it'd be real neat if the trainer was then attached to a device to capture the hydrogen.
Is hydrogen the energy answer though? If it is, I think this would be a nice way to get it. Individuals would be responsible for their energy needs and ultimately societies fitness levels would benefit as well. Wouldn't it be cool if you went over to your neighbor and asked, "hey, you got any hydrogen I can borrow?" If we could produce even just 100 watts for an hour on a trainer, would this be able to create enough hydrogen to power a car for 50 miles?
Just a thought.
PS - This idea was inspired by Specializeds innovate or die campaign on their website. Their demo innovation was a simple dc generator attached to a trainer that went to an ac inverter to make power for a computer. I just tweaked the idea a bit. http://www.innovate-or-die.com/