Click on this
i'm not kidding. I myself have recieved microsoft points totally free of charge. It works becuase they work together woth advertising companies so they are funded by them. All you have to do is click the link above and sign up (Which is totally free) and complete offers to gain points. You can then redeem these points to get free stuff, ranging from ps3's, World of warcraft prepaid cards and even ipods (touch, nano, whatever). You can also custom order a product from amazon or ebay and they will buy it for you. So, in effect anything is in your reach. You can get free stuff or work for it.
The link is once again: