The Filioque (Again)

Michael Liccione has posted an essay on the perennial topic of the Filioque over at Sacramentum Vitae. In addition to this interesting article I would recommend the articles posted by Al Kimel on the subject. Finally there is a pretty descent overview of the issue from an Orthodox POV located here. It also has some links to excellent essays and articles on the subject. Caution some of these articles are not light reading.