Razib of Gene Expression and I go back a long way of .....friendly disagreement on pretty much everything. But he certainly knows his population genetics inside out. Check out Bumping uglies with the Neandertal (aka but they did interbreed!), The Genetical Theory of Natural Selection, preface & chapter 1 or Introgression, what's in a word? to get your Mendel, Fisher, Haldane and Wright education.
MarkCC of Good Math, Bad Math does what the title of his blog suggests, splitting his posts between explaining nifty mathematics, as in Why model evolution as search? and Zero and deconstructing non-sensical mathematical-appearing arguments by peddlers of pseudoscience, e.g., Dembski on Non-Evolutionary Math or Yet Another Crappy Bayesian Argument. So, if someone tries to blind you with a dust-shower of formulae and your math is a little rusty, ask Mark for clarification.
The Intersection is the very first science blog I ever discovered, the first science blog to ever link back to (and blogroll) my (then young) blog, and the blog whose blogroll was my own gateway into the world of the science blogosphere. Since then, Chris Mooney has become famous, with his instant bestseller and must-read book - Republican War On Science, as well as many articles in various newspapers and magazines (including SEED), public appearances, etc. He is now working on his second book, on hurricanes. Check out some of his recent posts: Inhofe Attacking Journalists (Again), Thoughts on a Hurricane Chris and Hurricanes, Population, and Damage.
Island Of Doubt is one of the four North Carolina-based blogs here on SEED. James Hrynyshyn is a journalist who blogs about many aspects of science, including political aspects and pseudoscience attacks, e.g., The sense of being stared at ...not, The real story of the hurricanes and Hold the presses: Evolution confirmed!
Living The Scientific Life (Scientist, Interrupted) is the home of the magnificient weekly Birds In The News. Grrrlscientist, who used to sign her posts as "Hedwig the Owl", is the resident expert on ecology and evolution of birds, as well as many, many other topics. She is the one most likely to find REALLY cool stuff on the web, like We Feel Fine. And she is a great (and prolific) book reviewer as well.
Carl Zimmer is a science writer - mostly about evolution - for, well, New Tork Times of all places. Here is a recent sampler from The Loom: Behold, For *I* am the Giant Flatulent Raccoon!, Yarn Versus Science: Who Wins?, Waiting for the Electrician, or Someone Like Him and Hopping to Wyoming.
Evolution, microbiology and partisan politics - all mixed together by Mike The Mad Biologist. A recent sampler: MRSA, Needle Exchange, and the War on Drugs, The Cult of 'Christian' Victimhood and Two Good Ideas From Lakoff.
Chris of Mixing Memory is a cognitive scientist who will explain the topics of his field in great depth and detail - yet you WILL be able to understand it. Here is a very good collection of some of his posts on Metaphors, and on Cognitive Science Of Art. Also check out recent Graham Priest On What Philosophy Is and a must-read Mirror Neurons, Language, and Meaning (Oh, My!).
You will giggle with smug self-satisfaction along with Evil Monkey, every SchadenFriday on Neurotopia. More seriously, you can go there to learn some cool neuroscience, e.g., How Exactly Do Infant Brains Wire Themselves For Speech, Anyway?, Stem Cells for Spinal Cord Injuries and Everybody Post About Mirror Neurons!!!
Errrmmmm, do you really need an intorduction to Pharyngula? After all, that is by far the most famous and popular science blog on the planet. PZ Myers writes about genetics, development, brain, evolution, cephalopods..., yes and about creationism, religion, politics and pseudoscience. Did I mention sex?
I was wondering how you would describe Gene Expression - well done. As you know, I share your reservations about that particular blog, but Razib certainly knows his subject.