Warmth for Kitties: An abandoned kitty has taken up residence in a box on our porch. We installed an outdoor small animal heating pad (totaling $37) to help out with the overnight temperatures dropping to 14 degrees. Kitty seems very happy! Highly recommended if you can spare the 25 watts. See CozyWinters.com and look for the "outdoor" version.
Also, here's an excellent resource for learning about options for keeping kitties kozy.