The Amazing Mathematical Object Factory gives verbal and visual examples to help explain discrete mathematics and combinatorial objects (whatever *they* are). It offers creative scenarios and exercises to help abstract concepts become more accessible to younger learners. Includes links to various, creative, math sites.
This brief article describes some of the specific technologies that can be used in a mathematics classroom to move problem solving online (such as SMART boards, webcams, screen captures, etc.)
Video solutions of math problems from Basic Mathematics, Algebra, Geometry, Trigonometry, and Calculus. Most problems have four different video solutions, each done by a different person (most of them also have one in spanish).