The Voice of One Crying Out in a Closed Communion

Should communion (i.e. Lord's Supper) be an open or a closed thing? Arthur Sido at The Voice of One Crying Out in Suburbia does some reasoning with the bible in mind in his post, The Communion Default. I agree that it should be open to all Christians because it is, after all, the Lord's table, and not ours. And as one who has been humiliated by closed communions, I have experienced the damage that a closed communion can cause. Give it a read.