Here are three new additions to The Best Sites Where Students Can Work Independently & Let Teachers Check On Progress:
EdCite clearly looks like the best of the three – it’s free and very easy to use. I learned about it from Class Tech Tips.
The other two – Kids Discover Online (for Social Studies) and Whooo’s Reading (for literacy) seem to offer some decent materials, though they also both require payment. Neither’s cost is outrageous. The also both offer some free resources, but those are pretty limited.