I know from when I was homeschooled for most of our science books we used the Apologia series. It was written by a professor and geared towards homeschoolers. I know a lot of people who use writeathome.net for help with their writing and English. Check out
Live & Learn Press - Every home is a school, what do you teach? for some good homeschool resources too. If you have any questions feel free to ask.
How old are your kids? When I was homeschooled I took an online programming class one year, but its no longer available. I'm thinking of starting my own programming class online for homeschoolers, would this be of any interest to anyone on this board?