Thought I'd share my favorite websites for kids right now:

http://www.fun4thebrain.com/  Isaiah HATES substraction, but he will play the penguin math game all day long (and he's practicing subtraction for fun!)
http://www.starfall.com/ We've been using this since Isaiah was 4 and we all love it.  I like it because my 7 year old can read stories on it, my 5 year old can practice sounding out words and my 3 year old can learn her letters -- all on the same site.
www.sportsmansparadiseonline.com/Live_Owl_Nest_Box_Cam We've been following this live feed of a barn owl with her babies.  It's really neat!