May I suggest performing a permanent redirect of cocos2d-iphone.com to cocos2d-iphone.org or visa versa?
Its really bad for the site's SEO to have two domains floating around displaying the same content. Not only does Google mark down what it believes is duplicated content, you also have the problem of incoming links coming to one OR the other domain. This spreads out the site's backlinks across the two different domains, thus degrading the Page Rank of the site.
There are also problems with the cookies on the site if you log in at one domain, then click a link that takes you to the other version.
If you do a permanent redirect from one to the other then Google will convert links in its index to the other URL which should boost the site's page rank.
Just a suggestion,
-Sunsu