Sag Harbor (the book) was excellent

Sister Blogs:

• Fivethirtyeight
• New Majority
• Overcoming Bias
• The Monkey Cage

Statistics:

• Chance News
• The Endeavour
• Christian Robert
• Revolution Computing
• Yu-Sung Su's Blog
• The Numbers Guy
• Messy Matters

Visualization:

• Junk Charts
• Flowing Data
• Information Aesthetics

Cognitive and Behavioral Science:

• Decision Science News
• British Psychological Society Research Digest
• Seth Roberts [experimental psychology]
• Criteria's Employee Testing Blog

Social and Political Science:

• Monthly Labor Review Precis
• Marginal Revolution [economics]
• Language Log
• Social Science Statistics
• The Baby Name Wizard
• Vox EU

Machine Learning:

• Machine Learning (Theory)
• Nuit Blanche [imaging]

Cultural:

• Love the Liberry
• Can't Stop the Bleeding
• Light Reading
• Paperpools
• Ward Six
• Streetsblog