Well, we've just started homeschooling our oldest ones--4 and 3 years old. It's going great so far.
Also, my company hosts a website that features a whole bunch of great books for older homeschooled kids (and their parents, too). It's almost all supplemental reading--historical fiction, high fantasy, etc. Great for kids who can't get enough to read, but their parents are worried about what they might bring home from Barnes & Nazi: