I’ve been reading and benefiting from the Internet Retailer magazine. Although I’m not heavy into the Internet retailing business, I find that most of the articles are applicable to managing content sites because they talk about focusing on an audience and providing a focused delivery of products or services to that audience.
You can access it online or order a free subscription to the paper magazine (call 312-362-9532 or go to http://internetretailer.com/renewal).