Recommend some useful math-related sites to you:

Forums:

The Math Forum @ Drexel University

Math Help Forum

Math Is Fun Forum

S.O.S. Mathematics CyberBoard :: Index

Softwares:

Roman Lab Software

Graph Functions, Graph Equations, Creating Data Graphs

Alentum Software - advanced software for Windows

CGAL - Computational Geometry Algorithms Library

Welcome to Dekov Software

Discount Educational Softwares

Linear Programming and Sheet Cutting Library

Sites:

Math.com - World of Math Online

Mathematical Association of America: MAA Online

--John