http://mathworld.wolfram.com/
http://www.actstudent.org/testprep/index.html
http://www.math.harvard.edu/~knill/mathmovies/swf/maandpakettleaddition.html
http://www.purplemath.com/
http://www.mathacademy.com/pr/quotes/index.asp?ACTION=TOP&VAL=creativity

See the Algebra 1 page for links to aid with Gateway practice.