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This is a really great idea! I can imagine people in the future designing/coding/deploying simple webapps from a single photoshop-like interface.

How does it know to put clever class names like ".social-actions"? Is it gleaned from layer metadata or something?

It doesn't get class names from layers, yet. Because, most often people don't rename their layers (they are usually "Layer 1" and "Shape 1").

It has a editor which quickly allows you to name classes (Screenshot: http://cl.ly/image/0q2O0O0y2B1P)

That was the only piece I couldn't understand. This is fantastic, great work!

It might be pulling data from the PSD such as names of layers and comments

This is a cool suggestion. We haven't done that yet though!