Aplusmath.com: 

National Library of Virtual Manipulatives

http://nlvm.usu.edu/en/nav/vlibrary.html

 

Interactive Math

  http://www.interactive-resources.co.uk/mathspack2/counton/count1.html TRY  
  http://www.teachers.ash.org.au/jeather/math/dictionary    THIS!! http://mikesmeb.googlepages.com/prep
Coolmath.com - An amusement park of mathematics... and more! Worksheets of your own to make. Triple A Math