What do mathematicians do? by Jon Berrick, National University of Singapore
Where Mathematics Comes From:
How the Embodied Mind Brings Mathematics into Being, by George Lakoff &
Review of this book
The n-category cafe This is not strictly speaking on popularisation and teaching, but more on the area of higher dimensional algebra, a big development in the 21st century.
Mathematics under the Microscope , link to Alexander Borovik's book and blog