I love, love this Guest Hollow site! (Thank you Kristi for sending this link to me!!) There is so much on this site from free curriculum that they have put together themselves, to awesome reviews and MANY links to sites that have awesome things as well. If you find my homeschool links helpful, then you MUST check out Guest Hollow.
Oklahoma Homeschool has some good general homeschool information, forms, and some unit studies to check out.
Education World has some lessons and resources.
Here are some really good ideas for educational games that you can make.
Here are some generic games boards to print and make your own games.