I'm a big fan of any tech that gets people out of their cars and the gocycle (warning, Flash site but its totally cool, I promise) does just that.
The way the bike stows is equally awesome. You could easily put this in the trunk of your car and take it out whenever you wanted.
Totally diggable, now if the price isn't too insane.....
Actually, they lease the bike to your employer for 12 months and then will be made available for sale at a special rate.
Its a neat idea and I'd be interested in giving one a try but I don't think it would work out especially well given my lifestyle and how odd my work schedule is.