Here are a few more sites I have saved and used in the past:
http://www.bunchofboys.netfirms.com/teaching_with_games.htm -Teaching with Games
http://edweb.sdsu.edu/courses/edtec670/cardboard/BoardTOC.html - Cardboard Cognition
http://www.googolpower.com/content/free-learning-resources - lots of free games and resources to check out.
http://jc-schools.net/tutorials/gameboard.htm - ready made games and board games to print
http://www.netrover.com/~kingskid/Math/math.htm - a long list of games for practicing math.
One other game we use a great deal for multiplication practice is Times Attack, it is without a doubt. one of the best math practice games out there. Taking a tour that Ben Harrison (the creator) to understand how the program works fully is so helpful and a real must. It is a real video game so if you have video game lovers they will love it. We use the free version and the boys love it.