One thing that crossed my mind was to keep a blog of your more interesting commutes. Might not get much readership but it can be a way to keep yourself motivated. You know, you're trudging through a heavy snowstorm, you can't see more than a few feet in front of you, you're freezing your butt off, and you still have 3 miles to go. Could make for interesting reading on days when you feel like it can't get any worse. Just go read your blog LOL.