Sites like EdGate.com and Family Education Network aggregate learning content and offer free services geared toward parents in general, while sites like Homeschool.com, Homeschool World and Eclectic Homeschool Online target domestic education -- the latter two with a Christian slant.
However, the compounding costs from an incomplete education shows up in lost wages for employees, remedial training among colleges and universities, and even our aggregate growth rates for the national economy.