California Common Core State Standards
GeoGebra, free mathematics software for learning and teaching. Link to GeoGebra's online applet start: click here
Dan Meyer: Math class needs a makeover, TED talk from March 2010
Spreadsheet of Dan Meyer's Three-Act Math Tasks
The Mathematics that Every Secondary School Math Teacher Needs to Know, Alan Sultan and Alice F. Artzt, published in 2011 by Routledge, New York, NY.
An Episodic History of Mathematics: Mathematical Culture through Problem Solving, by Steven G. Krantz, published in 2010 by the Mathematical Association of America.
Knowing and Teaching Elementary Mathematics, by Liping Ma, published by Lawrence Erlbaum Associates, 1999.
Journey through Genius, by William Dunham, published by Penguin Books, 1990.