Jason Van Orden's excellent book Promoting Your Podcast (is in stores now). And don't worry, this ain't just hype, I did read an early release copy.
He's running a little “buy now get some cool free stuff” kinda deal. He's only offering the pack to the first 200. I know they'll go fast.
Trust you me this, you want the book. It's $10.85 at Amazon as I write this. Get the free stuff from Jason as well and call it the best $15 you'll spend this month (with shipping).