First off I really like this definition from Guy Kawaski's Blog
Blogger. n. Someone with nothing to say writing for someone with nothing to do.
He goes on to teach us about the The Art of the Layoff
Next up are the Ten Insane Ideas for Microsoft by jledgard
Another interesting post was this old one titled The Corporate Weblog Manifesto. I really like this one.
Finally Anil Dash speaks about Making Something Meaningful