Nail. Head. Hit it. 43 Folders tells us about the Five Mistakes Band and Label Sites Make. These rules certainly apply elsewhere on the web as well – hey flash developers: Guess what, people really do want to Deep Link.
Just in general? Don’t let your web designer build a portfolio piece on the back of your fans and your business. Ask your fans what they want, watch how they use your site, and then give them what they like without a lot of hooptedoodle.