As someone who believes in efficient transportation I'm a big fan of bicycles for short trips up to about five miles. Unfortunately it takes some infrastructure change to make this partial in many countries and it seems unlikely in most of America.
Bikes, on the other hand, seem to becoming increasingly popular for sport. Indoor ergometers are being combined with software and large screen TVs to produce more realistic simulations of racing. I wonder if non-competitive versions will evolve for those who are more interested in this as indoor exercise during bad weather?