Put an ad free Google Safe Search for Schools onto your wordpress blog. This widget is powered by Google CSE and is very simple, the CSE is provided
by http://primaryschoolict.com which is run by a team of educators and emphasizes more educational results. Plugin URL = http://www.mclear.co.uk/2009/12/safe-search-ad-free-plugin-for.html
Unzip to plugins folder and activate site wide.