Specifically, breast cancer research at the American Cancer Society. The prize is a pink camo Dura-coated Stag Arms AR-15, the pictures are not the final finish, it is still being worked on, but it is pretty representative of what the pattern will look like. Tickets are $5 a piece, and all proceeds are going to the American Cancer Society. All state, federal, and local laws apply, so if you live in a gun-unfriendly state like California then they plan on selling it for you and sending you a check instead. Or you could put it up for auction online, adding even more to the charitable contribution. If there are any questions on how you would go about receiving it, I can probably answer most of them and if not, FBMG would be more than happy to answer, as would the guns subforum in DU.
http://larrycorreia.wordpress.com/2008/08/04/the-pink-camo-breast-cancer-charity-gun-post/http://www.fbmginc.com/Breast-Cancer-Raffle-AR-15_p_1-8969.html