It shows up at the top of the forum for me.
edit: I see what ya mean now. In the engine forum it's an announcement at the top, but some of the others it shows at the bottom of the page. In the "Engine" forum it is shown as an announcement, but at the bottom and in the other forums, they are shown as seperate forums (sub-forums, it appears).
Not sure if they can do anything about that with the forum software, short of making every post in the FAQ's, Archives, etc, as an "announcement".