MIT’s opencourseware should be in every homeschooler’s bookmarks (or dare I say any person who likes to educate themselves?). If you, or your teens, are applying to MIT, stating that you’ve completed some of these courses gives you a big advantage. This is also a great way to introduce one’s self to higher math, science and pretty much every other subject – for free.
Yale is starting a pilot program to do something similar. Although the free online courses may never replace going to college, it is a great way to explore new material from an extremely reliable and knowledgeable source, especially if you are a life-long learner.