Three of my favorite sites are: Toys (all sorts - science and games/math etc.) http://www.arvindguptatoys.com/toys.html http://www.thetoymaker.com/ Again a mix of math and games and a bit of sciencey stuff http://cp.c-ij.com/en/contents/1006/ Wonderful ideas to put together for the children or for them to do. A definte construction job for some elements.
Thank you! That's a fantastic site but I'd forgotten about it. It's not just toys but if you go to http://www.arvindguptatoys.com/ and click on "books" and English" you'll find a huge list of fantastic science books, including some fantastic ons for kids by Isaac Asimov that are brutally hard to find. Thanks again for reminding me about this site, you made my day!