What on earth took me so long to explore this fabulous resource? Vault.com's publishing section on its website is just amazing--chock-full of articles and facts on publishing careers, such as salaries, day-in-the-life articles, company profiles, industry info, networking boards, a sample resume, job and internship listings, and much more. Some of the content is free, and some of it you have to have a subscription to view.
Vault does all this to promote its book on publishing careers, Vault Career Guide to Book Publishing. At $29.95 and only 128 pages, it's kind of steep. Plus, it's more than three years old at this point. When they come out with a new edition, I will be sure to review it here.