Joel talks about some of the lessons he learned while starting Fog Creek and getting CityDesk off the ground.

The moral of the story is: quality matters.  FogCreek initially spent too much time tinkering at the edges.  They were distracted by marketing, piracy prevention, and affiliate programs.  It wasn't until they focused on delighting their customers that they saw a significant increase in sales.

Who's your customer?  Are you focusing on things that will make them happy?