When I don't commute by bike, I usually take my folding Xootr MG scooter (www.xootr.com). It is a little slower than the bike (it's still pretty quick), but weighs half as much (under 10 lbs) and is much much easier to take onto a crowded train. It is also a ton easier to carry up the eight flights of stairs that are part of my usual commute.

My Xootr is great, but it is about five years old and I am wondering if there are any scooters out there that are better/lighter/faster. Bicycle technology improves a lot every five years, but I'm not sure about how much scooters have developed.

Any other scooter riders out there? What do you ride an why?