If you've been keeping up with the comments on the last post, this article might be interesting to you: Challies discusses the spiritual challenges of homeschooling. It is by no means a homeschooling-bashing party, but a pretty frank discussion of what potential problems can come from choosing to educate children at home. I think discussions like this are rare and important; homeschooling is often seen as "the answer" rather than "a good choice."
One of the common motivations for homeschooling is to keep negative influences away from kids - but this is both impossible and (even if it were possible) not a good enough reason. If they are Christians, parents are still sinners, quite able to exert some very negative influences upon their children (as well as the positive, righteous influences). Homeschooling guarantees nothing, though it is often chosen as a guarantee.
To take this a step further, it is God's good and gracious plan that we live life in a covenant community larger than our family. In many churches, when a baby is baptized, the church family enters into that covenant, promising to help the parents in the raising of that child in the fear of the Lord. To edit Hillary Clinton, It Takes a Covenant Village.
I am the federal head of my home, the one responsible for my children's education (what a weighty resopnsibility!), but I refuse to be the only one influencing them. I need their Sunday school teachers, other fathers and mothers, the elders of the session to come alongside and offset my weaknesses and negative influences. My kids need you and your kids need me. The family alone is not sufficient; the covenant community is. This is all to say, when parents choose homeschooling (often a fine and great choice!), they have a responsibility to make sure the natural insulation of homeschooling does not extend to their life in the church.