The UPA (Ultimate Players Association) has recently released the 11th edition of the official ultimate frisbee rulebook. They can be found in PDF format here, or in Microsoft word format here. The major changes from the 10th edition rules are summarized in this document. There is also a discussion group set up for any feedback on the new 11th edition rules, as well a blog.

The following is found on the UPA website: The 11th Edition of the Rules of Ultimate has been approved by a vote of the UPA membership. The new rule set passed by an overwhelming majority of voting members with 1393 out of 1627 members voting for approval. In order for the membership to approve the 11th Edition as the new official version of the rules, at least 600 members needed to vote, with a majority in favor of the new rule set.