Larry Felazzo has listed some AWESOME elementary math websites in his blog post of December 10th about best websites.
My favorites so far are:
Max’s Math Adventures
free interactive math activities
video introductions to concepts
Glad you found them useful!
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(yes, I read a half-a-dozen things at a time)
Little House in the Big Woods
Push Has Come to Shove
No Other Gods
Treehouses You Can Actually Build
One Thousand Gifts
Wall Street Journal