I bought a treadmill at the end of 2011 for the same reason as Kelly as didn't really get into using it that much, I tried watching a movie and then just used it for speed training, so no more than 40 minutes on it really. As soon as a half decent day/evening came along I was outside and a lot happier. Mine is now on eBay.
Spend your money on some new gear for running outside in winter weather, you'll be so much happier.
For me, a coating of Glide and then liberal amounts of Sudocrem on what are the more sensitive spots on the soles and toes. Worked a treat on my last (only) marathon.