The world list will be really helpful - thanks Kriston - and I will check out all the suggestions but the history linked one from Minnie might work right away - he's already into a few weeks work on Story of the World and I was wondering how to tie something science in with that to a greater extent. I mean, next week they mummify a chicken - so that counts right?
LOL - we counted that as science and did some internet research on how the baking soda, salt, etc would work to preserve the chicken. That was really a gross little project! The kids loved it though and bragged to everyone they had a mummified chicken in the basement.

The history/science tie in is a great idea. I'm struggling with what to do for history this year. We did SOTW last year volume 1 with alot of extra materials from the library, etc. But SOTW wasn't a big hit for DS (better for his younger sister). I might just do it to hit both kids and let him work with some other stuff. I think I'm for sure going to have him read incrementally the cartoon history of the universe. I think that will be a hit and easy. Usborne's encyclopedia of World history has been a great resource and is a format that my son particularly likes. And has internet links!