Blogger and former high school math teacher Dave Marain provides problems and answers that any mathematics teacher or student who cannot get enough practice. MathNotations is also organized topically and provides much food for thought in the form of inspiring and thought-provoking quotes.
The blogger is a professor of applied mathematics at Cornell University and offers expert information on his math-related blog spot.
This is a non-profit publishing house blog specializing in courses and books on non-commutative algebra and/or non-commutative geometry. NeverEndingBooks gives itself one year to learn (and report) about the many aspects of the book-production cyclus and to explore whether an alternative exists.
Konrad Voelkkel's Bloghttp://blog.konradvoelkel.de/themen/math/
Konrad offers a variety of information on mathematics and a variety of other subjects... Topics covered include metaphysics, flat modules, physics, algorithms, and much else in this diverse and interesting blog spot.
The tagline for this one is... "A mathematician thinks aloud." While he covers math related issues, the blogger also delves into topics that are a little bit more weighty than math, such as immunity, T cells, and autoimmune diseases.