Grab A Link:
Of course, we used good ole flash cards. You can print them here.
Multiplication.com (Times Attack and games)
The Math Worksheet Site
Another method that may work well if your child is musical or likes rhyming is Times Tales.
Encouragement: If your child is having problems memorizing the multiplication tables, or even addition, pick a method that works well and stick with it. Patience is the key. Lots of patience!