Eisenberg, who I will Blog about in more depth shortly because of his new book, Call To Action - Secret Formulas To Improve Online Results, pretty much nails it in this article.
Here's a snippet:
"Designers are also likely to talk about how a site or design 'feels.' Often, a site can feel right, but perform badly. Designers are right; a site should feel right. But it should also convert."
If that's not a tease, I don't know what it.
The article is available here: ClickZ's - Five Critical (And Overlooked) Design Elements By Bryan Eisenberg