Several of Autodesk's employees run their own blogs through the company's servers, and they're chockablock with tips, techniques, and some occasionally highly entertaining digressions. For a list of all Autodesk's blogs, go to www.autodesk.com/blogs. The AutoCAD-based blogs I highly recommend are Shaan Hurley's Between the Lines, Heidi Hewitt's AutoCAD Insider, Kate Morrical's LT Unlimited, and Lynn Allen's Blog (that's what it's called, honest!).