My program Book Scanner is already on the market. It allows you to quickly and easily scan thru products(DVDs, Video games, books, just about anything with a barcode) and get price data for them. Then you can list the product for sale on amazon straight from your phone, or output a list of links to quickly do it from your computer.
Check it out on the Android Market its called
You have to have Barcode Scanner installed for it to work, so just open up Barcode Scanner and scan my avatar, then push open browser. It will open up the market to install my app!
Let me know what you think.