Free books online for homeschooling!

I just wanted to post about the free resources online for homeschooling. One of the best sites out there is Project Gutenberg. Most of the books for the kids are not in the best format. On top of that, there is no questions to go with the stories to see if your child is actually reading it. We have been putting together a flash document with the Uncle Wiggily stories that have questions at the end. We(Dh and I) thought others might benefit from it. They are posted on Captivatedminds.com(free of course). We will have more stories everyday, since these are for our own children. We will have so many by the time the rest of them begin to read!