Five Band & Label Website Mistakes
Five Mistakes Band & Label Sites Make is very good, though a bit nerd-centric. I obviously agree with just about everything written there and have been doing it for years. But I also know that most of the music buying public doesn't care about deep linking, RSS, or ID3 tags and they still think a cool looking Flash site is pretty cool looking.
That being said, I think the tips are essential for any indie record label and great for any musician who's thinking about relying on the Internet as a major source of promotion.
Update: Great Metafilter discussion here.