I've got the NDS Lite limited edition.
It is the Limited Edition sold in U.S. Pokemon Center together with the release of Pokemon Diamond/Pearl. It is the metallic black (more precisely, onyx) NDS Lite with Dialga and Palkia printed on the front cover. I think this limited edition only had total of 1000 for sale...
I didn't bought it directly from Pokemon Center. I bought it on web from AuctionYahoo when I was traveling to Hong Kong.
It was BRAND NEW! But the price I paid for it was only about 1/2 of the original released price. (It is a VEEEERRY great bargain)