It appears that with electrics the problems that occur because of the low energy density of batteries are low performance and weight. Most i have seen have a range of 20 miles or so while moving the bike at 15-20 mph (unassisted). But this comes at the price of a bike weighing 50-80 pounds. And they're expensive. Still, it might be useful for those not in the best of shape and/or have a evil hill on their commute. Some links i found on treehugger:
http://www.50cycles.com/torq_spec.shtmlhttp://www.aprilia.com.au/bicycles/enjoybicycles.htmlhttp://www.greenspeed.us/machine-x_zvo-bike.htmhttp://www.avantibikes.com/index.php?opt...p;amp;Itemid=24 
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