I'm a creature of advertising legends. My background is in non-profit marketing, so I live vicariously through the books and wisdom of the titans who came before me (and following people currently in the business via Twitter). I recently ran across DDB's publication of "Bill Bernbach Said," a spiral-bound compendium of quotes from the man who pioneered artistry in advertising.
It doesn't matter if you're starting in the industry, or have a few decades under your belt -- there is still much to learn from the godfathers of advertising.
I really encourage picking it up.