Well, the pickings in the US are a bit skim. But Kinetic makes mopeds. So does Hero-Majestic (suppesedly formerly Puch). There's also Avanti, which resembles the older Italian models (Garelli, Motori, Bianchi, etc). There's also Zundap, at least on the West Coast. There's also a crazy looking thing called Cyclone (or something like that) and another one that's a Mosquito DX (but more of a 50cc mo-kick). The best, in my opinion (at least in looks) are Hero-Majestic and Avanti.
I'm sure there are other makers out there, but these are the only ones I know of. In other countries, there are TONS. I'm working on getting a 1999 or 2000 Piaggio Ciao into the US. Any ideas?