Xbox Rewards: http://xbox-livecodes.com/
Using Xbox Rewards, you can get a lot of Microsoft Points for free. This is not a scam and it's 100% legit. You can be sure of that because it's directly from Microsoft. You can't get anymore legit than Microsoft. You'll need a Windows Live ID and a Gamertag. I also reccommend you download Internet Explorer 9. If you combine this with the Bing Rewards method, you can get quite a lot of Microsoft Points.