Edit: If you're talking about the changed version this morning, check out the screenshots at the bottom to see what dcurtis was mad about.
Basic layout? Also the color scheme, font hierarchy, whitespace around elements (which is a critical portion of the design), and basically every trick dcurtis used to draw the eye and maintain the mental flow of the app.
I willingly admit that, not being a designer, I may well have miss the subtlety in the basic layout that is important. Is there really that much in the column sizing?
With that said; you are right about font/colors (I hadn't noticed).
I give credit to Nate for taking steps to address those similarities following feedback, and I hope he goes further with that.
Basic layout? Also the color scheme, font hierarchy, whitespace around elements (which is a critical portion of the design), and basically every trick dcurtis used to draw the eye and maintain the mental flow of the app.