Here are some of my favourite sites with lesson plans and information about teaching digital photography to children...

YouthLearn
Better Photo
**Adobe**
Education World
APTE
Photocritic Photography Blog
kidica
Discovery Education
Instructional Technology Resources
APTE
Literacy Through Photography

The sites below are great for learning about photography...

Digital Photography Review
photo.net
DP Review
Learn Photography

Other great photography sites...

Pics 4 Learning
Flickr
PhotoFun
Shutterfly