Great web search site designed for kids by librarians. All subject categories included, also has popular topics: entertainment, sports, facts. Found on Librarian Chick's List of Open Source/Open Courseware Resources.

Go to Khan Academy's Computing Hour of Code for complete sets of tutorials - great for 3rd - 8th graders. Here are 2 I'd like to try: Dana P.
1. Hour of Code - 10 yrs + Students program drawings with Java Script, but need good typing skills and working keyboards
2. Hour of Drawing with Code Blocks - 8 yrs. + Students drag and drop blocks of Java Script code instead of typing (this program is debuting in its 1st year, so may need some tweaking - includes a survey to complete.
Each option includes:
* videos and talk throughs - how to teach programing
* coding challenges - students practice concept (program grades and awards points)
* final project (creative way for students to use what they learned)