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Thanks for your reply. Yep, it's number 4 on your list, too - just the same as you're getting. In the SEOmoz report it's ranked 50, though. Very strange.

I agree with what David said. Also, Google says they do not want to index search results in their search results. I'm unclear how this would be implemented, but you do also want to think of what is a useful results page for your searchers, and will a q=keyword result provide a better or worse results than /biology. I worked for a site that included (among other things) lesson plans. There was one for physics that didn't require calculus. If you did just a keyword query for calculus, you would get the result for that physics plan, as the description included the word calculus.