Microsoft is introducing another reward system, Microsoft Bing Rewards. You can earn a 250 reward points just by signing up and can earn points by searching on the Bing. You need to install the Bing Bar, then register with the Live account.
You can redeem the reward points for
Gift Cards
Digital Downloads
Charitable Donations
Electronics
Movies, Music & Games
Computer & Office
Movie Tickets
Bing Gear
You can join and read more here