The most detailed cover letter resource in print, including networking, "cold", broadcast, follow-up, fatal cover letter mistakes, and hundreds of top notch letter samples. In addition to an easy-to-use index, the book includes strategies for people changing careers, relocating, and recovering from layoff.
Holy buckets, I'd be lost without this bad boy. I think every cover letter I have ever written has bits and pieces of it taken from this book - it allows me to sound professional and succinct. As a result, I actually feel more confident when I go in to an interview.