The 404 page for Apple's search forums helpfully offers a link to search their forums. If you click it, you get this less helpful screen:
I thought I had noticed something missing recently in the discussion forums, but I figured that the search capability was a figment of my imagination. Now I know that it was there at some point and then taken away at some later point. Very bad form!
[UPDATE (7/16/2008): Oh. They could have at least put a link to that announcement on every page so I would've seen it. Oh. They did. Sorry, Apple Discussions Administrators!]