The MSN Cashback program had enough interest that Microsoft decided to migrate the program to it's shiny new search engine, Bing. The concept was simple, if you search for products and make a purchase from the search engine and the product displays a Cashback coin icon, you will get some cash back.
The program never gained the traction that Microsoft has hoped for. Microsoft announced on it's blog that it would cancel the program. Cashback will remain open until July 30th, but users will have a full year to redeem their rewards.