Downtube folding bikes are great bikes. Lots of fun to ride, and I love how easy they are to fold and unfold. (and how easy it is to store and transport!)

Here's their website: http://www.downtube.com/

My mom loves her Downtube bike. (thanks, Uforgot!) She has one with the Sturmey Archer internal hub. If I ever get a folder for myself, I will also get an internal hub. Those puppies are nice!