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Excellent Drawing Resources
I figured I'd start up a thread for the best drawing tutorials and whatnot from around the web. These are the ones that jump right out at me -- I know there are other excellent resources out there, and I'll be adding more as I remember/find them. I really hope that everyone else who has something will post it -- this isn't entirely altruistic. 
Andrew Loomis's books
Andrew Loomis was a classic American illustrator who wrote a bunch of friggin' BIBLES on how to draw and paint. These books are pure gold, and since they've been out of print for decades, I think they're fair game for downloading. They all deal specifically with drawing except for Creative Illustration and Eye of the Painter, which are more general. EDIT: Link's dead, but they're not hard to find if you google.
Thumb War
This is a concept artist's tutorial on thumbnailing during the design process, but there's excellent stuff in there to apply to any kind of drawing -- especially the stuff about "your brain as a 3D modeler", and the stuff about "detail sniping". Be careful if you poke around the rest of the site, though, because there's some stuff that's INTENSELY NSFW.
John K's $100,000 Animation Course
John K (creator of Ren and Stimpy) has an excellent blog where he's been incredibly gracious in sharing his knowledge. This series of articles, despite the title, is less about animation and more about solid drawing fundamentals. It's based on Preston Blair's classic animation book. John K's articles on composition are also excellent, as are his "Backgrounds, Layout and Style" posts. Really, the whole thing is amazing, though some of it is probably only really interesting to animation students, or fans of classic American animation.
PSG7
I know Mankoon has posted this link before, but since we're consolidating here, this is an excellent one. It's mostly focused on digital painting, which I'm avoiding here, but there is some excellent basic drawing advice, mostly toward the end.
Andrew Loomis's books
Andrew Loomis was a classic American illustrator who wrote a bunch of friggin' BIBLES on how to draw and paint. These books are pure gold, and since they've been out of print for decades, I think they're fair game for downloading. They all deal specifically with drawing except for Creative Illustration and Eye of the Painter, which are more general. EDIT: Link's dead, but they're not hard to find if you google.
Thumb War
This is a concept artist's tutorial on thumbnailing during the design process, but there's excellent stuff in there to apply to any kind of drawing -- especially the stuff about "your brain as a 3D modeler", and the stuff about "detail sniping". Be careful if you poke around the rest of the site, though, because there's some stuff that's INTENSELY NSFW.
John K's $100,000 Animation Course
John K (creator of Ren and Stimpy) has an excellent blog where he's been incredibly gracious in sharing his knowledge. This series of articles, despite the title, is less about animation and more about solid drawing fundamentals. It's based on Preston Blair's classic animation book. John K's articles on composition are also excellent, as are his "Backgrounds, Layout and Style" posts. Really, the whole thing is amazing, though some of it is probably only really interesting to animation students, or fans of classic American animation.
PSG7
I know Mankoon has posted this link before, but since we're consolidating here, this is an excellent one. It's mostly focused on digital painting, which I'm avoiding here, but there is some excellent basic drawing advice, mostly toward the end.
Comments
James Gurney (the Dinotopia guy) keeps a fascinating blog. It updates with ridiculous frequency and covers everything from oldschool art tools to fundamental drawing/painting/all-art-ever tips and random stuff he thinks is interesting. The guy is some sort of genius.
I just remembered a couple more good resources:
Posemaniacs
I know this has been posted on the forum before. 3D figures sans skin (I like to call them "Hellraisers") will pose for you in 30-second increments. Good for practicing getting your quick gestures down when you don't have access to a model. However, I don't recommend trying to study anatomy from it. The distortions at the joint will screw you all up. For that, there's...
Visible Body
This is an INCREDIBLY detailed 3D model of the human body with skeleton, muscular system, nervous system, and everything. As artists, we're mostly only interested in bones and muscles. But it's got all of them, and you can focus on any individual bone or muscle, and hide any of them, to get a better look at what you want to see. It's an amazing way to get deep in there and see how everything fits together. Unfortunately, it's now a pay service. You can check out the head for free, though, and they've got a free trial. Maybe you can set aside a week or something (I don't know how long the trial is) and do some SERIOUS anatomy study.