We sometimes use Wikipedia to help the boys with their homework – most recently Josh had to write about India etc. However, we’re always a little nervous about what else they might find.
Then I bumped into Wikipedia for Schools and the problem is solved! 
This 2008/9 Wikipedia DVD Selection is a free, hand-checked, non-commercial selection from Wikipedia, targeted around the UK National Curriculum and useful for much of the English speaking world
Excellent stuff – the power of open content…
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[...] They generally ask if they can Google, Wikipedia YouTube etc, although they can have free access to the Child Friendly Wikipedia clone. [...]