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Have you looked into Gifted Homeschoolers' Forum (GHF)? You may wish to check especially the Homeschooling tab and the Favorite Things tab. GHF offers a great roundup of homeschool resources.

Many families also enjoy Rainbow Resource, DK books, Every Good Book, Resources list on the Davidson Database (DITD), Hoagies' Kids, Mensa for Kids, Library of Congress (LOC) resource lists, free printable worksheets from Crayola, and enchanted learning, to name a few of the many resources available.

As others have mentioned, the resources you choose will depend upon your child's interests and how advanced he is. This may be a great time to let your son lead, and explore many things.