Following the discussion at http://forum.nimrod-code.org/t/139, from this post on, all user generated content on this forum will be licensed under the cc-wiki license. Consider this post as an official marker for the license change.
Up to this post there was no statement on the site, and therefore all posts previous to this one fall under default copyright law, meaning that the content can't be shared without express consent of the author. While this post/thread is the first notice of the license change, in the future the forum templates will also add to the footers a link to the license with additional information regarding the change.
While the change from default copyright to this license is unlikely to bother anybody, if you really don't want your posts to fall under the new license your only option is to stop using this forum. Sorry about that.