About the places to print: I've seen a lot of these (another one recommended is ophoto.com), some seem to be more professional than others, and some seem to be there just to help you printing your holiday pictures taken with your digital camera, while others can offer larger sizes and better quality papers and prints. I found it very strange that some work with JPEG only though.

I didn't use any of them because I could do some good prints with local print houses - not extremely perfect (a protective finish could've been applied), but good enough - for a reasonably smaller cost if I had to send a CD to them to be printed (since some of the images can't be sent by e-mail due to their sizes), pay the shipping back to me, then ship it again to the buyer.

One of the images being sold on Ebay is this one. Of course if you set a starting bid as $0.01 you can attract more people to your auctions, but there's the risk of selling it for that price. A somehow evil remark: if I had permanent collections being shown at MoMA and other known places (as it's said he has), I wouldn't be selling my stuff for just $0.01.