Math Research Newsgroups

comp.soft-sys.math.mathematica (Mathematica-related topics)
discretemath (Discrete mathematics teaching and research discussions)
geometry.research (Forum-hosted discussion on research-level geometry)
sci.math (General math topics)
sci.math.num-analysis (Numerical analysis topics)
sci.math.research (Math research discussions)
sci.math.symbolic (Symbolic computation discussions)
sci.stat.math (Statistics discussions at and above the college level)

Math FAQs

sci.math FAQ
linear programming FAQ
nonlinear programming FAQ
Numerical Analysts Net