It's a script that creates an eBay affiliate store for you. You make money by promoting other peoples eBay items - when somebody buys something from eBay via your BANS store, then you get a commission. See the link in my sig for slightly more info --- EDIT: Beaten by Richie (only by seconds!), I should have typed faster!
It is a script to build an eBay store with your affiliate links. Many people in DP has used the program succesfully to generate sales, including me If you are interested check out my tips where i give out free tips on how I make money with BANS.
I too generate money from using this. There are a lot of review out there about this program and they are good. Also check out: PHPBay eShopDaddy (check my sig) Before purchasing any of these programs be sure to get accepted by eBays affiliate program first or you will be wasting your money.