Oh, hey, writers, here’s some good stuff: Self-Promotion for Introverts, from Nancy Ancowitz. Someone gave me this free brochure (note: PDF), with job-hunting in mind, but I think the brochure and the blog posts also apply very much to promoting yourself as a writer — published or emerging.
I also like what she has to say about avoiding your own personal energy crisis. I suspect other writers struggle with this too.
EDITED TO ADD: Nancy also directed me to this post she wrote especially for writers, whose duties most definitely “extend far beyond the keyboard”. Great tips for new and aspiring writers.