Penistone Railway Works has officially been open for less than a month and today I made my first sale! At 10:02 this morning someone bought a spark arrestor for the L&YR "Pug". If you go back through Shapeways live feed you might still be able to see the sale for yourself -- if not you'll have to trust that I didn't doctor the screenshot.
In a way I'm really happy that the first item I sold was a spark arrestor as this is the object that initially got me interested in 3D printing, and which led to me setting up Penistone Railway Works.
Now I know one sale doesn't make a successful shop but it's a start.