Scootering

http://www.electric-bikes.com/kickers.htm <-- For descriptions of all scooters below except Chariots<>
Chariot (Bicycle-Like at Front, Scooter at back)
Quadcarver (four wheel scooter)
Sidewalker Micro large wheels
Mountain Scootboard
Bike board Bicycle wheel at front, two little skateboard wheels at back.
Trikke Cross between kicksled and scooter. Three wheels, stand on two platforms, single wheel at front. http://www.fitterfirst.com/TR-B.html No pedaling or pushing. Like in-line skating, surfing, snowboarding, or skiing on pavement. http://www.trikke.com Rhythmic weight transfer from one leg to another
Kickbike Two bicycle wheel, platform at center.

http://www.maxmatic.com/ttw_index.htm Tilting three wheelers