mostly antiques (bottles, coins, vintage records, comic books,games and toys,boxes , jewelery,ceramics, postcards). Old and new original artwork. also some tech. phone and computer stuff. besides the obvious ebay and nonviolenceglobal.com (Art)
http://search.yahoo.com/search?p=best%20online%20art%20and%20collectibles
They have over 1800 members who buy, sell or collect antiques and art. You will get more specialized feedback this way.