Notebooking and Lapbooking have become a major component in our curriculum in every subject. It serves as great interactive tool for the students and a great assessment tool for me. Our children retain a lot more information while assembling and interacting with the notebooks/lapbooks as opposed to the random worksheets. The are free to copy and use, but not for sale or resale. I also compiled a list of links to various sites with great notebooking and lapbooking pages for free.
Hearts of Wisdom
Homeschooling on a Shoestring