I worked for some friends a long time ago doing traffic control plan software (at http://www.invarion.com/ http://www.invarion.com/). We were a startup, three o

I worked for some friends a long time ago doing traffic control plan software (at http://www.invarion.com/ http://www.invarion.com/). We were a startup, three of us in the office, that's it, so when customers would phone one of us would have to talk them. A lot of the customers were not super technical, and I would have to answer questions about features that I had implemented, or bugs that I couldn't have imagined. It was illuminating, and gave me a new respect for developing software and really considering the end user and their needs and abilities.