Here's a side-by-side comparison of the folded size of 4 makes of folders taken on my commute this morning.
In the right corner, we have Bromtpon S-Type, Dahon MU XL, and my Xootr Swift. In the left corner, we have a Dahon Speed D7, and a Montague. Surprisingly, the Montague makes for a small folded package, once the front wheel and seatpost are removed (just make sure you give yourself some time for re-assembly).
Close-up of the big 3: