Doing things by the book works in the long run. Google do an article about googlebots and how they rate
www.google.com/webmasters/bot.htm and
seo.htm.
Do you have detailed stats, so you can see where individual visitors come from?
It turns up very useful surprises (e.g. ranked no.1 out of 18,000,000 on a Yahoo search - my google page rank for that page is 1).
