Does size matter?

At a con a few weeks past ("Back (exhausted!) from Capclave"), one of my panels, Does Size Matter?, dealt with the perennial topic of story lengths. As this is a matter of perennial interest among con-goers and aspiring writers, I decided to make it the subject of a post.

How I write: 
When the idea comes first -- and for me, usually, it does -- I let the story evolve into whatever length it s...