just fitted a tortec velocity rack in black to my giant mini-velo.

Its recommended for lightweight carrying - the narrowness of the rack goes well with the space-saving ethic of the mini-velo, and it has really adjustable fixings. I did have a dahon rack on, but it never fitted properly. Suspect it would go well on folders like the xootr too. Bought mine a lot cheaper than the one on the link as well.