Jim Butcher's LiveJournal
Jim Butcher's LiveJournal has some of the most useful, concise essays on the craft of fiction writing available anywhere, let alone for free on the internet. Create flesh-and-blood characters, build tension in your plot, and make your characters react to the events of your story believably.
Thank you for the link Mr. Kane. I've only read one or two of Butcher's books, but i did love the Dresden Files tv show version too. This is a writer who really knows how to build worlds.