Seth Godin

Seth has one of the most-loved marketing blogs on the internet, has penned more than a dozen bestselling books and launched a social site that attracts more than 50 million viewers per month. Yet he makes little effort to cultivate a following, preferring to be discovered virally.

 I love that!

I recommend you read anything he produces.  If you need a starting point I suggest:

• Tribes
• Permission Marketing
•  The Dip
• Purple cow
• Really... anything he writes tends to be worthwhile.