Skyride from Scott Olson of Rollerblade fame
Scott Olson seems to have a new creation. A pedal powered monorail looking thing. I wish him luck.
News with video:
2000 Montague CX, I do not recommend it, but still ride it.
Strida 3, I recommend it for rides < 10mi wo steep hills.
2006 Rowbike 720 Sport, I recommend it as an exercise bike.
1996 Birdy, Recommend.
Wieleder CARiBIKE (folding), decent frame.