Like you I find so many really useful places for information these days. Here I log where I can sources that I regularly check for useful info. I hope this helps you as much as it has helped me.

General

• the physical educator
  •  lil help page where PE teachers try to help each other improve their PE teaching
  • A list of interesting chats on PE. #physed #pegeeks #pe4learning #pechat #gcsepe #PE #pescholar

Tennis

• the next point a blog on mens tennis I started following when I read forsaken geometry. Very funny and very interesting.
• heavytopspin.com Very good analysis of the 2013 us open mens final plus
• changeovertennis Good analysis. Run by three guys.
• tennisabstract comprehensive stats site
• parentingaces tennis parents. How to handle your kids talent. How to encourage and support instead of squash. recommended books
• madtennisparent a tennis parent sharing their thoughts.