Just saw your last post John. The kits we've mentioned are the reliable ones, the Heinzmann in particular being the highest standard of German engineering. It's available with two battery types, a carrier platform type sitting neatly under the carrier surface, or a one or two part side pannier style battery.
The Currie's battery box is in frame, but it's not so wide that you'd need to cycle "bandy". I believe they also may do a carrier version now. The motor fits alongside the rear wheel just behind the spindle on the kit version and is quite unobtrusive. Indeed, if it's used with panniers, the motor below almost disappears from casual view.
Here's the Currie kit link:
http://www.electrodrive.co.uk/kit.htm
and I don't know if youve seen the Currie on the road video, here's the link:
http://youtube.com/watch?v=6d9qXGf-yiw
and here's the Kinetics link for the Heinzmann motors:
www.kinetics.org.uk