Some disagreement and other best practices from Teal Sunglasses (via Phil Ringalda). Chuqui sez (abbreviated version)

• Don't be first: be interesting.
• Don't blog because you should
• it's your blog. Write it the way that you feel most comfortable, about things you are most interested, in a way that you enjoy. Otherwise, you're going to grow to hate it, and your discomfort (unhappiness, hate, etc) will show through to the readers. If you don't like/love what you're doing, why should they? But your love for what you do will infect those around you.

The great thing about blogging is that there are no rules. It's so easy to experiment and see what works.
And what works for you--hey, that's an answer.