This seems like a perfect hack for certain forums on my site! Great work.
Quick question though -- will this "must read" page show up for everyone who tries to post a new thread, or just new posters who haven't done this before? If it's the former, I'm just worried that oldtimers might get a little annoyed if, every time they post, they're confronted by the same "must read" page that they've already read!
And I have no idea if that paragraph made any sense.