a week or so after getting a letter in the mail from G asking me to return to adwords I get a wmt notice today of unnatural links to one of my sites. I haven't touched the site on-page or built any links in the last 6 months. And I can only find 3 links pointing at it. What's even more puzzling is it doesn't rank for any keywords and only got a few hits a day anyway. I just quit with the site since I had other things I needed to do and never went back. I just find it a strange coincidence that it happened that way.