Blogs: From the Warp
From the Warp is an outstanding 40k hobby blog by Ron Saikowski. This site includes how to's with advanced painting and modeling tips, showcases Ron's personal and commission work, and offers free to download gaming aids. I particularly like the painting concept and discussion posts like 'Consistency is the key to good painting', 'Painting your models: Love to or hate to?' and 'Success and failure when it comes to painting'. If you enjoy this side of the hobby, it's well worth a look.