My friend is an online retailer and he says that one of the largest problem that retailers face is the lack of methods to reach new buyers. He checked out a couple services and found Happy Retailer.
I think this is a very interesting idea to allow retailers upload inventory in one place and sell them simultaneously on Amazon, EBay, Bonanza and more than 1001 websites!
If you are retailer it might be interesting for you.
You can get more details here http://happyretailer[dot]com/?from=dtm