I'm loving the articles on Talent Zoo. Here's one that I hope stays live for a while, it outlines the essential traits of a copywriter.
My favorites are #8) A strong stomach. Mustn't get a stomach ache after having ideas rejected two or three times; and #30) Suspicious. The ability to doubt everything.
In my opinion writers should question everything, research like fiends, be savvy with pop culture and, in fact, become cultural anthropologists. Note that the man who put this article on Talent Zoo is an anthropologist AND a copywriter. As you should be too.