This is the updated list for the basic concepts posts that science bloggers have recently been doing.
Clade at "Evolving Thoughts"
Evolution at "Sandwalk"
Gene at "Pharyngula"
Fitness at "Evolving Thoughts"
The Central Dogma of Molecular Biology at "Sandwalk"
How do you sequence a genome? at "Discovering Biology in a Digital World"
How do you sequence a genome, part II at "Discovering Biology in a Digital World"
How do you sequence a genome, Part III at "Discovering Biology in a Digital World"
How do you sequence a genome, Part IV at "Discovering Biology in a Digital World"
How do you sequence a genome, Part V at "Discovering Biology in a Digital World"
How do you sequence a genome, Part VI at "Discovering Biology in a Digital World"
Biological Clock at "A Blog Around the Clock"
The Three Necessary and Sufficient Conditions of Natural Selection at "Greg Laden"
The Modes of Natural Selection at "Greg Laden"
Species at "Evolving Thoughts"
8th Grade Math at "Gene Expression"
Linkage Disequilibrium at "Gene Expression"
Introduction to Microbiology and Infectious Diseases at "Aetiology"
What is a gene? at "Greg Laden"
What is a gene? at "Sandwalk"
Anisogamy at "Behavioral Ecology Blog"
Prologue to Dating Techniques at "Afarensis"
Measuring Fitness at "The Questionable Authority"
Cell Migration at "Migrations"
Artifacts, Vectors at "Discovering Biology in a Digital World"
Hearing at "Retrospectacle"
Normal Flora at "Aetiology"
Force at "Uncertain Principles"
Fields at "Uncertain Principles"
Energy at "Uncertain Principles"
Mean, Median, and Mode at "Good Math, Bad Math"
Normal Distributions at "Good Math, Bad Math"
Standard Deviation at "Good Math, Bad Math"
Margin of Error at "Good Math, Bad Math"
Natural Numbers and Integers at "Good Math, Bad Math"
Recursion and Induction at "Good Math, Bad Math"
Numbers at "Evolutionblog"
Infinity and Infinite Sums at "Evolutionblog"
Correlation at "Good Math, Bad Math"
Logic at "Good Math, Bad Math"
Syntax and Semantics at "Good Math, Bad Math"
Arguments at "Adventures in Ethics and Science"
What's a Feminist Theory of Science, Anyway? at "Thus Spake Zuska"
Falsifiable Claims at "Adventures in Ethics and Science"
Sets at "Good Math, Bad Math"
Turing Machine (with Interpreter) at "Good Math, Bad Math"
Modular Arithmetic at "Abstract Nonsense"
Real Numbers at "Good Math, Bad Math"
Theory Testing at "Adventures in Ethics and Science"
Real Numbers at "Good Math, Bad Math"
Halting Problem at "Good Math, Bad Math"
Epistemology at "The World's Fair"
What is Ecology? at "The Voltage Gate"
Pottery in the Archaeological Record at "Hot Cup of Joe"
As I noted before, this is a very hard thing to do, much harder than we normally might be inclined to think; so everyone above is to be congratulated on their promising attempts. I'll continue adding to the list as I become aware of new posts.
Several things strike me about the list so far: (1) Where is chemistry? (2) Most of the basics covered are theoretical. This really isn't surprising, but there are practical concepts too -- basic ideas used in experiments, practical applications, and so forth. (I'm thinking of things as diverse as dissection, force diagrams, cloud chambers, microscopes, and so forth.) Some of the posts do discuss concepts like these, but I, for one, would really like to see more posts that deal with basics of lab and field work on the list.
Also, don't forget the science blogging anthology.