I hang most of my clothes (including my bike shorts) on the back of my office door. (It does help that I'm an "owner" and can do pretty much whatever I want). We have "heating units" along the exterior walls, and first thing I do when I arrive (which is well before most of the employees show up) is place my gloves, arm warmers, balaclava, etc on the heating unit to dry. They are usually dry when I come back from taking my shower, so I put them on a shelf in my office until it's time to dress for the trip home.

I also keep a floor pump under the desk, which doubles as a towel rack during the day. It's next to the computer, and the heat from the fan makes the towel nice and toasty by the next morning.

There are several underutilized closets around the office, as well as a couple of rooms that mostly have computer equipment in them. I do occasionally hang my jacket in one of these closets. I'm sure that if we had more bike commuters, we'd start using these closets for bike clothes. Several people in the office have expressed an interest in commuting once the summer comes; we'll see how many of them follow through.