Hey,
I gotta say I'm very impressed with the maths help forums but I did have a question about the forum rules page (the actual page not the rules). Crawlers and Spiders can not click the tick box on the forum rules and therefore can't index the forum topics and posts. I don't know whether the rule page allows spiders (as I'm not a search engine) or this is done intentionally to prevent spiders viewing the content (which is a good enough reasion). When searching your site in google
http://www.google.com/search?hl=en&q...m&aq=f&oq=&aqi= most pages crawled are from the search lookup and members profile pages, rather then forums and posts (I would assume this was because the spiders can not click the tick boxes).
Please understand I'm not critising the site. I can understand why you may want restriction of posts or that you have already allowed crawlers, but I just thought I should draw it to your attention as it could increase traffic.
Phil