One April 1st the much missed Sheldon Brown came up with the concept of POWerwheels, which had twice as many trailing spokes as leading spokes: http://www.sheldonbrown.com/power_wheel.html
(Eight radial spokes each side, and four trailing ones in the middle of the rear wheel. 850g _a pair_, $15,000)
If you suffer a freewheel failure, or anything else which stops the hub rotating, the wheel will collapse, surely ?
-- Ian Jackson personal email: <[email hidden]> These opinions are my own. http://www.chiark.greenend.org.uk/~ijackson/ PGP2 key 1024R/0x23f5addb, fingerprint 5906F687 BD03ACAD 0D8E602E FCF37657