My first year as a serious (since August) bike commuter:

The good:
I've lost 17 pounds I didn't need.
I'm outside every day for a least an hour.
I didn't have to spend a fortune to ride comfortably to work almost every day for 5 months.
Info and support from participating in Bike Forums has been outstanding! Thanks Joe!

The bad:
It's all good!

The ugly
My kids are driving all over the place in my cars while I'm helping the environment in my own small way.