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)
Kizzy Ann Stamps
Time's unfading garden : Anne Spencer's life and poetr
Finding Day's Bottom
Running Your Butt Off
Roll of Thunder Hear My Cry (for the zillionth time)