This list will be updated regularly has I discover new resources.
Ambleside - a free homeschool curriculum designed to be as close as possible to the curriculum that Charlotte Mason used in her own private and correspondence schools.
Khan Academy - The Khan Academy is a non-profit educational website created in 2006 by Indian & Bangladeshi American  educator Salman Khan, a graduate of MIT and Harvard Business School. The statedmission is "providing a high quality education for anyone, anywhere". (wikipaedia)
Currclick - Your one-stop shop for homeschool downloads, ebooks, lapbooks, live online classes for homeschoolers, unit studies, affordable curriculum, novel studies. Have free offerings on a weekly basis otherwise charges apply.
GEOGUESSR - a fun,educational game for exploring the world - totally addictive!
MULTIPLE DOWNLOADS/PRINTABLES/THEMES FOR HOMESCHOOLERS