Primary School TV has just opened up for public beta. I have been involved in the project for several months now. The cool thing about Primary School TV is how it filters content, I did a short talk about this and uploaded it to youtube.
PrimaryT is letting me release the UI and some of the aggregation technology as open source, so keep an eye on github. It should prove as a useful template / boiler plate for people wanting to make their own tv / video site.
Removing barriers of accessing video content whilst keeping a child in a safe environment was the main challenge. Thankfully (after rigorous testing) we think we have overcome those challenges and the initial testing has been positive.
I hope you get some time to check it out and let me know what you think/how it performs.