2 plus 2: The Home of Mathematically Correct (Critiques of Current Math Fads; Effective Math Instruction)
"Review of High Quality Experimental Math Research." (Robert C. Dixon et al. National Center to Improve the Tools of Educators.)
Singapore Math (One of the Best. Check Samples for All Grades)
Evaluation of Different Math Programs
Bill Quirk's Math Site (Good Resources and Critiques of Bunk)
Owen Thomas's Links and Papers: Geometry, Algebra, Calculus
Owen Thomas's Links on Math Education: Critiques and the Right Way
Mathematics Software Links From Jeff Lindsay
Paul Cox's Glossary of Math Mistakes
http://www.c3.lanl.gov/mega-math (Mega Mathematics)
http://forum.swarthmore.edu (Math Forum)
California's Math Curriculum (After They Woke Up!)
Saxon Publishers (See Their Products. It's Not SRA's Direct Instruction Curriculum, Connecting Math Concepts, But Right-Thinking Folks.)