We've begun the process of purging the URL functionality of the old spider links on the forums (/boards/). Please update all of your links to use the equivelant on the forum (if the bottom of the page you're linking to says it's a mirror, you're using the old URL's).
We are doing this as there is a bug in the old coding which allows users to basically use the script as a proxy to differant sites and sections on this site which isn't only not allowed by our rules but is also proxy applications aren't allowed at our host. There are also numerous bugs in the script that we just never got around to fixing.
It's not difficult to rewrite the URL's for the forums and Google should purge out the old data after the next few crawls.