You may have seen this posted on BlueCollarmtb.com before, because Brompton bikes are really cool. I first heard about them when my step-brother was stranded in England with a bad Visa. Anyhow, he bought one to ride around the town. The best part about them is that they are foldable and very functional. You can easily take it with you on the plane, train or car. It folds to the size of a meduim sized piece of luggage.
You can get more info from Brompton HERE