Well, I spent some time today optimizing this hack and got it so the forum index page is done using only 2 additional queries. That is a good thing

I cut the total queries down to virtually nothing. You can eliminate one of the queries most of the time if you use PHP-Cache.
I also added PHP-Cache to handle sub-forum display, but thats another hack entirely.
So..I'll redo the instructions and repost them. With the new code it doesn't add much load at all to the forums. I still have to optimize forumdisplay the same way, but that one isn't as bad because usually there aren't as many forums on that page.
Ethan