I just picked up one of these, brand new, for practically nothing on FleaBay. Works like a charm on Windoze7 and quite fast.
I was slightly disappointed to see that getting the thing to work with anything Linux-y requires reading a lot of length threads (e.g on the Ubuntu forums) followed by some unspecified amount of futzing around. This would have been useful with my HTPC otherwise. Oh well.
USB device ID is 148F:761A and apparently, the thing is alleged to contain a MediaTek MT7610U chipset.
If anybody is maintaining a hardware support wish list, please add this.