Math Baseball at Funbrain - Choose Math Baseball, then set it for multiplication. You can also practice other math facts here! http://www.funbrain.com/math/index.html
Multiflyer!! - One of my favorites and kids love it! http://www.gdbdp.com/multiflyer/
Rain Forest Maths! - A great math website! http://www.rainforestmaths.com
Online Flashcards! http://www.aplusmath.com/Flashcards/multiplication.html