Mike Shulman: I think this page would be even more useful if it included brief notes about what sort of activity tends to go on at each blog in the list.
Eric: Good idea, but maybe too much for any one person, so if you find your blog listed here, please provide a note about it. Note: I added a blurb to the The n-Category Café for a sample.
Math Overflow has become a universal clearinghouse for questions and answers “of interest to mathematicians”, modeled on stackoverflow.
Alasdair’s Musings Mainly (but not entirely) mathematics education and computer algebra systems.
Climbing Mount Bourbaki (Akhil Mathew)
Delta Epsilons A group blog focusing on algebra, representation theory, and Olympiad-style problem-solving
Division by Zero (Dave Richeson)
Geometry and the Imagination (Danny Calegari)
Gyre and Gimble (Charles Wells)
Mathematical Musings (Interactions of probability, statistical physics, topology, and combinatorics. Matthew Kahle)
Mathematics and Computation (Andrej Bauer)
Mathematics and Physics (Richard Borcherds)
mathlight (just started, by an lab regular)
Maxwell’s Demon (Edmund Harriss)
Motivic Stuff (Andreas Holmstrom)
Secret Blogging Seminar run by 8 recent Berkeley Ph.D. graduates. “Sort of like a seminar, but with (even) more rude commentary from the audience.”
Teaching College Math A blog about math, technology, and teaching.
The accidental mathematician (Izabella Laba)
The Rising Sea (Daniel Murfet on algebraic geometry, derived categories and the like)
The unapologetic mathematician (John Armstrong)
Three-Toed Sloth (Cosma Shalizi)
What’s new (Terence Tao)
Please see this page.
The nLab, or -Category Lab, which you are reading right now!
Luca Trevisan’s LaTeX to Wordpress converter
This nifty script fixes the eyestrain caused by poorly designed blog contrasts. 15 seconds to install, works for Firefox only.
Detexify for finding LaTeX symbols by drawing them.
LaTeX on Blogger for installing LaTeX on Blogger.