Mars Hill Audio Journal - "to assist Christians who desire to move from thoughtless consumption of modern culture to a vantage point of thoughtful engagement." (Their bi-monthly audio magazine is priceless--get their free demo!)
Stephen's Guide to the Logical Fallacies - an invaluable resource to visit periodically, so as to keep your thinking clear and sharp. Fallacies grow like weeds in the human mind, and must be regularly exterminated!