Google is hosting webspam full of no follow links, and on pages not blocked by their robots.txt . Examples you ask?
http://www.google.com/notebook/public/14850757980663635699/BDQGkIwoQ5ZKuv7oi
http://www.google.com/notebook/public/00436616168795648972/BDQtGSwoQ2Ke859ch
http://www.google.com/notebook/public/06079336479504989007/BDQlbIgoQ8MDsqPsh
I guess Google Notebook is a great place to do a little web spamming.
Google
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