Apparently there was some big changes in the Google Algorithme recently. I wrote a post months ago about how to use the nofollow attribute for internal linking (PR sculpting): be aware that this is apparently changing and the use of NoFollow internally does not seem to be advised or accepted by Google.
See below a pic [...]

This was the online marketing buzz of the week. Gocompare has been blacklisted from the search engine result pages…. again? Yes, again! It has happened last year already in January 2008. They were at the top for “car insurance”, which is a crazy competitive keyword, but Google finally found out the huuuge paid links campaigns [...]