For Grades K-6
I just found this webpage with almost 100 interactive, educational games on a large number of topics, especially Math and Literacy. It looks very promising. Are there any games here that might be useful to you?
Let me know if you end up using any of them and how. I'm becoming a bigger and bigger fan of online games to help with the heavy lifting of memorization at the 8th grade level and I'd like to know if they are useful in the younger grades as well.
Oh - and I was just turned onto this mapping game to help very young students learn the New England states:
A good week for online learning.