The Tools Artists Use is a website full of interviews with working artists. Interviews that ask the practical questions. Questions like
Do you have anything you use out of the ordinary for making your art?
If you prefer pens, is there any particular brand, color, or type of ink you like best?
Do you ever do any kind of post-processing (like adding color in Photoshop or similar tool) to your drawings?
The Fluent Self is a blog for "when you need some destuckification" from the insightful Havi Brooks. And she's got some advice for artists who want to sell their work online that I think you should read even if you want to sell your work offline. For example, we all need a reminder to Make it easy.
Jonathan Mead contributed a posting to the zenhabits blog that I think you might need to read. It's called Seven Productivity Habits for People Who Hate GTD, and it's an alternative to the (famous) (popular) (generally darned effective) Getting Things Done, an alternative that might be more suited to creative practitioners. He had me at habit #1, Create a "to stop" list.