Pre-Algebra textbook website with test and quiz practice http://www.classzone.com/books/pre_alg/oltp_welcome.cfm
Algebra I textbook website with test and quiz practice http://www.classzone.com/books/algebra_1/oltp_welcome.cfm
Study Island http://www.studyisland.com
Online Graphing Calculator http://www.geocities.com/function.grapher/
Math games http://www.bbc.co.uk/education/mathsfile/gameswheel.html
More math games, practice, and cool resources http://www.mrnussbaum.com/mathcode.htm
Algebra Help Site http://www.coolmath.com/algebra/
Math help - Dr. Math http://www.mathforum.com/students/