Math Magician (practice those basic facts!) http://www.oswego.org/ocsd-web/games/Mathmagician/cathymath.html
Math Skills Practice http://www.aaamath.com
Math skills practice http://www.aplusmath.com
Math Games http://www.coolmath4kids.com/
More math games http://www.funbrain.com
Multiplying Fractions http://www.321know.com/fra66mx2.htm
Adding Integers Game http://www.aaaknow.com/equ65_x2.htm
Fraction/decimal review (tank) http://www.toonuniversity.com/flash.asp?err=198&engine=