There is a site called
Ancient Civilizations for Kids
It covers all the ancient civilizations that are taught in the 6th grade, including China and India. It basically will link students to other sites, and they are listed according to civilizations.
I plan to use this site as a resource, and pick the links from it to put in my computer activities for my students, rather than have them search through all the links themselves.
One of the best ways to find good sites is to go to a search engine, and type in "kids," followed by a coma, and then the subject. So far I've gotten great results.
Lynne