There is a mod here and also available at vB that generates a "cloud" of terms based upon how someone initially found your site through Google. From what I've seen, it seems to work real well, which makes sense. You currently rank for certain terms and this fills those resulting pages with more keyword friendly terms. It sounds great, but it appears to be outside of Google's guidelines. I was curious as to thoughts of other forum admins. It would appear that Google *might* be able to determine if someone was using this tool and it could possibly penalize sites. Part of my reasoning comes from reading this discussion at vBSEO. Thoughts?