There are always reference materials available. The question is whether you want references that are unbiased or biased towards a particular answer (for or against). Unbiased materials would be any encyclopedia, biased against would be any Chick Young (or similar) pamphlet on the subject and biased for material would be in "New Age" book shops.
scholastic is one of the best websites
Popular Mechanics for Kids books can be found on Websites such as Amazon or Powell Books. The Popular Mechanics for Kids DVD sets are available for purchase on Websites Amazon or eBay.
Read to them, also help them choose their own books
Webkinz and Poptropica are some good sites
Teaching kids about money is an important developmental process. With that in mind, resources for achieving this task are available through educational websites and finance websites alike.
By buying one of those kids books that teach you how to write if you're talking about writing
Teach your young kid's English with story-telling youtube winklingworld @winklingworldkidsstory
There are several websites online that will give you arts and crafts ideas to keep you occupied with your kids. You can teach them step by step after reading.
There are many websites that are designed for kids including PBS Kids and Time for Kids. The public library also offers a category that is designed for kids and includes books, DVDs, games, and music.
Teach your kid's English with story-telling youtube winklingworld @winklingworldkidsstory
The Bernstein Bears books are good moral lesson books. They are also given in the Chik-fil-a kids meals for free!
There are a number of websites that have crossword puzzles for kids that one can print. They can be found on sites such as 'abc teach', 'puzzle choice' and 'Print Activities'.