I do both design and development so I'm not really sure what side of the fence I fall under, but in the last year or so I've actually transitioned to writing the HTML first and then designing in photoshop as well. I actually find this method to be far superior to skin first, but then again I am a good enough developer that it makes sense to me to think in this way easily. I'm surprised that this method comes as such a surprise to HN, I thought it was a much more common practice.

The best part is that this leads to very clean and well structured HTML, and a better design because you know exactly what your content is.