This is a nice collection of search resources designed for children. From the site itself: "Here you will find search forms for the major Internet search engines for kids.Below these are Internet search engine links, links to web guides for kids, some specialized search engine forms and specialized search engine links of interest to kids.At the bottom there are links to family friendly or general WWW filtered search engines and links to more pages like this."
It's a nice resource, although I'm not sure how up to date it is. I checked out the links and all the ones that I tried were fine except for the Encarta site, which has been gone for a long time now. Otherwise, good stuff - thanks to Hazel for finding it and alerting me to it.