One of the issues people raised when we ran our article about riding your bike to work was that there was no place to put the bike when they got there. Personally I think US cities need to step it up a bit with the bike infrastructure, but until then you can use one of these and have no trouble finding a place to put your bike.

The Tikit, by Bike Friday is a sweet little ride, and by the looks of it pretty easy to fold and unfold.

This kind of ride is great for hybrid commuts where you spend a bit of time on the train and a bit ridding around.