Bing Rewards It's a Microsoft sponsored program. Install their toolbar, do some searches and they'll give you points, take those points and redeem them for prizes like Amazon gift cards, Microsoft points, and a bunch of other stuff. I've gotten one $5 Amazon gift card and a few hundred Microsoft points. There's a cap on the maximum amount of points you can get, (6000 I think) but that shouldn't be a problem if it's free anyway. What I do is log in to Internet Explorer every other day (don't have firefox open, it'll absolutely kill it) do a few searches and close it up, but if you like IE8 or 9 by all means use it. I'm a little over 100 points away from being able to grab either that Amazon gift card or MSP. Anyway, thought I'd throw it out there for those of you who like them some free stuff especially if you want some Xbox LIVE Arcade games, but don't want to pay for them. Oh, and sign up and you get 250 points off the bat, which is almost half way to 400 MS points.
Edit: They recently added one month subscriptions.