I don't want to come across as pandering to Seth Godin, but this is a blog post that will teach you more than any other post, inspire you to examine your mindset on marketing entirely and generally open your mind to something new. This is one of the top marketers, hands down year-after-year.
This is Seth Godin's most popular blog postings for 2008. Don't miss it.
The list is strong 1-20. Having to choose only one, #10 - Ode: How to Tell a Great Story. These are good fundamentals all bloggers, business writers and storytellers of all types can post over monitors