Today was a good day for me: my first bike commute in to work. I have a cold right now, and it was also pretty fricken cold outside this morning, but hey, it was time! I got pretty cold on the first big downhill near my house, then warmed right up on the first uphill and stayed that way all the way to work.
It's about 4.5 miles one way, mostly suburban arterials with bike lanes or wide shoulders, and one bad hill. Bad by my standards, anyway, a little over a mile at a 6-7% grade. I'm thankful I bought a touring bike with low low gears (I'm a "returning rider" aka "out of shape").