http://www.instructables.com/id/How-to-build-a-72Volt-electric-motorcycle/I remember when electric bikes were such an oddity that only a small handful popped up on the almighty web. Now they seem to be everywhere.
They still have some basic EV problems (range, speed, etc.) but they are starting to overcome those slowly but steadily.
I think one of these would be fun in the stable, but I'm not convinced that it would fit my riding lifestyle very effectively. Oh well. Maybe one day when I'm not running 100 mile days commuting.