I'm big on biking places. I rode my bike everywhere all through college, including to parties and a couple times to the bar. I currently have two bikes, one is a all mountain rig with 6 inches of travel all around, and the other is my beater put together from spare parts. I was looking at getting a road bike since it's been unsually rainy and the trails are all muddied up, which can be awesome until the trail police catch you when the trails are closed. Then I started looking into recumbent bikes. These things are still bicycles but you sit in a reclined position and pedal with a couple different muscles compared to a normal bike. I thought they were interesting, but who would want to ride in one of those. Then I say that the world land speed record by a human powered vehicle was a recumbant doing 80mph. Researching this a little more it turns out that these things can be made very aerodynamic with the use of fairings. I just have this image in my head of people traveling down the highway doing 80 on a bike.
I used to race MTB until my body gave out. Now I ride and bootleg race a road bike. Commuting to the store and errands is great they are quite a bit faster than a MTB. Maintenance on a road bike is a little less involved also. The folks I know that ride the recumbent say it good on their backs. The only thing about a recumbent is that being low to the groung there kind of hard to see unless you put a flag on it. And 80 MPH is for a short distance only but it would be cool to go that fast on a bike. I've seen 50 mph on a downhill before and even with sunglasses the eyes still water pretty good.