Bloglist

Direct links to the blogs whose great feed headlines are used on SEO Streams – you should be reading them already

General SEO:

Graywolf SEO (Michael Gray)
SEO Theory (Michael Martinez)
SE Optimise
SEO Chat
David Naylor
Yoast (Joost deValk)
Search Marketing Standard
Search Written

Blackhat SEO:

Dink Style
Blackhat SEO Diary
Bluehat SEO (Eli)
Slightly Shady SEO (XMCP)
Esrun
Digerati Marketing (Mark)
Tellinya (5ubliminal)
Irish Wonder
Blackhat Digest
SEO Blackhat (Quadzilla)

Other blackhat SEO blogs worth reading (headlines not streamed here):

Oooff (Smaxor)
Cornwall SEO (Lyndon)
Dark SEO Programming (Harry)
Nicky Cakes
SEOcracy (Rob)

Even more sites of interest:

Wickedfire