Grammar Girl ... get yourself acquainted with quick and dirty tips on how to improve your writing. A great site for all those grammatically impaired people who are not afraid of knowing the difference between affect and effect. I read 101 Troublesome Words You'll Master In No Time last year and loved it (see my review).
People are best on records and books because you can turn them off or put them back on the shelf.
Evil Editor ... let's you know without any sugarcoating why you don't get published. From Feedback Requests to Guess the Plot your inner writer might learn a thing or two (if not distracted by his/her own laughing/cringing/chocking while reading). Maybe not for the fainthearted writers who take everything all too personally. Hilarious and evil, indeed. Also, don't forget to check out the Evil Editor Strips.