Dang. I let my first year commuting anniversary slip by unnoticed. (August 14th.)
The past year has been a great experience. I've ridden in temps ranging from 14F to 101F, a little bit of rain, a tiny amount of snow, and a lot of sun. Almost all motorists have been very accommodating. (I have this theory that most people in my small city don't care to ride a bike, but they do care to live in a city where one could.) I've put less than 300mi on my car in the last year and my 15 year-old daughter will probably just take it over next spring when she gets a DL. I've influenced one guy at work to start bike commuting full time and several others part time.
One thing that I find interesting is that I'm still figuring things out after a year. How best to get a can of gas home for the lawn mower. How best to deal with a last-minute lunch meeting with a friend. How best to get to work with laptop, clothes, shoes, lunch AND join the local group ride in the evening. What is the best route to here or there. And where are the best placed to lock my bike at the businesses I patronize.
The best thing, though, is that I'm just happier out in the fresh air.
One year in; more to come.