K.,
I find a lot of good links through the newsletters of http://www.thehomeschoolmagazine.com/E_News/index.php.
They have a freebie friday where someone lists several sites that have free info/worksheets/etc dealing with different topics. It might help narrow your search down.
I am HS a 3rd grader and a 1st grader for the first time this year and I have already used some of the suggestions they made and have also googled "how to teach _______" b/c we are having trouble with it.
We are using Time4Learning and Heart of Dakota.
Feel free to email me if you want to chat. : )