Here is a great resource for those of you who want to know what your children should be learning and when. It is a great resource if you would like to put your own curriculum together.

"Home Learning Year by Year" by Rebecca Rupp.
From the Publisher:

The integral subjects to be covered within each grade
Standards for knowledge that should be acquired by your child at each level
Recommended books to use as texts for every subject
Guidelines for the importance of each topic: which knowledge is essential and which is best for more expansive study based on your child's personal interests
Suggestions for how to sensitively approach less academic subjects, such as sex education and physical fitness