National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Learning Multiplication Facts
There are the usual, and some unique, tricks and games to learn and remember the multiplication tables at this site.
Doina Popovici
Math Play: Math Magician Game
A fast-paced game where students can practice addition, multiplication, and subtraction facts.
Shodor Education Foundation
Shodor Interactivate: Arithmetic Four
Students try to connect four game pieces in a row by answering whole number and integer problems. They can choose the difficulty level as well as addition, subtraction, multiplication, or division.