Dana's Low-Carb for Life (Podcast)
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Jimmy Moore is King of the Low Carb Bloggers. Read him at livinlavidalocarb.blogspot.com
If, like me, you're a big low carb research geek, you can't do better than Regina Wilshire's blog - I love this stuff: weightoftheevidence.com. Technical, but oh, so informative.
Both Dr. Michael and Dr. Mary Dan Eades - the Protein Power folks - have blogs.