This is an update now a year later. It still works and it is getting much much bigger. Just off the top of my head in the last month we have ordered flowers for my mother, popcorn for the kids, a plane ticket through Orbitz for my son, gift cards for our daughter-in-law, a whole bunch of printing, curtains at Macy's, used books on ABE books and a new book on Barnes & Noble, a magazine subscription,some sort of weird cable from Best Buy, postcards on eBay and a book from eBay UK. Each one of these was used after opening big crumbs first. Each one of them paid me back somewhere between one and 10% just for doing it through big crumbs. That's It.
The requirements is that you go to the retailer's website through this long list of retailers that is on big crumbs and that you have a PayPal account for big crumbs to deposit money into. You can still shop at any retailer with your normal credit card. My sons, and closest friends use this. It is an absolute non-brainer if you buy things online. Pretty much all of the retailers are on big crumbs -- but Amazon does not give you money back like the rest of them do. I am serious as a heart attack this is a good deal. It is free. It costs nothing they give you money for what you do normally. the retailer pays big crumbs for the reference and they split it with you.
Ttry this link & sign up unless you don't want to get free money back.
http://www.bigcrumbs.com/crumbs/howItWorks.do