This is a pretty cool giveaway-type thing that Nickelodeon is doing to promote The Legend of Korra.
You earn points by people either visiting your link or signing up on your link.
75 points earns a sweepstakes entry for a free trip to SDCC to meet Mike and Bryan
150 points earns a selection of unreleased Korra music
The first 1500 to get 300 points earn the Avatar Essentials Collection, which I am assuming is music also since it's from iTunes
The first 100 to get 500 points win a free Korra print.
So... have fun!