Here’s a list of blackhat blogs in no particular order. If I’ve missed one or two (very likely) drop the URLs in a comment.

G-Man: http://www.lookwhatgmanfound.com/ 

Quadszilla: http://seoblackhat.com/

DaveN: http://www.davidnaylor.co.uk/

The Blackhat: http://www.seo-blackhat.com/

Gotan: http://blackhatseodiary.org/

Beni: http://mybeni.rootzilla.de/mybeNi/

CDC: http://www.wagerank.com/

Irish Wonder: http://www.irishwonder.syndk8.co.uk/

Smaxor: http://www.oooff.com/

Eli: http://www.bluehatseo.com/

Countzero: http://www.blackhat-seo.com/

MORO: http://www.blackhatseoscripts.com

Levi: http://www.boogybonbon.com/

Esrun: http://www.onlinehoster.com/blog/

SEOIdiot: http://www.seoidiot.com/seoblog/

Busin3ss: http://busin3ss.name/

BHD: http://www.blackhatdomainer.com/

Earl: http://www.earlofgrey.com/blog/