Yesterday I discovered www.redbubble.com
The idea is that you upload your art work and they transfer it into Greetings Cards, Prints, Framed Prints, and even Tshirts.
You can then buy these but they also advertise them for sale for everyone else to buy.
They don't make anything until someone buys so you don't have to pay anything. You put your mark up on (I currently have 20% on mine) and they send you your royalties when you sell. They take a cut themselves and make and post the item. You keep the copyright to your work.
They also give you a special page with html to promote your work... like this: