Science sites: 

1. Bytesize Science: http://feeds.feedburner.com/bytesizescience

   Bytesize Science translates cutting-edge scientific discoveries from The American Chemical Society's 36 peer-reviewed journals into stories for young listeners about science, health, medicine, energy, food, and other topics.

    

2. American Museum of Natural History:  http://ology.amnh.org/
   

OLogy, the Museum's Web site for kids ages seven through twelve, is based on the premise that "everyone wants to know something," and is designed as a place for kids to explore, ask questions, get answers, meet OLogists, play games, and see what other kids are interested in. With age-appropriate content in archaeology, astronomy, biodiversity, genetics, marine biology, paleontology, and physical science, OLogy makes science learning rich and engaging. Educators can find suggestions and tips on how to use the OLogy Web site in the Educator's Guides.  

3.  
   Sheppard Software: http://www.sheppardsoftware.com/

   We design educational software and online games with these goals: 1) To add sound and visual effects to make learning fun and more memorable. 2) To design games with many difficulty levels so that players will continue to be challenged no matter how far they progress. 3) To provide games that will exercise players' brains.

    

    
4. Newton's Apple:  http://www.newtonsapple.tv/index.php

   Video clips for all sorts of science concepts plus lesson plans and experiments to try.  Have fun