Seth Godin is among those who've been encouraging the rest of us to be generous (being generous is a common theme in his book, Tribes). Seth himself gives away a piece of business insight every single day of the week. Tim Grahl is an expert who advices authors on how they could build their own tribes. His clientele includes Wall-Street Journal and New York Times bestselling authors. He too advices authors to provide free content for their tribes. And leads by example by giving away a lot of his own quality information. His recent giveaway is a comprehensive list of book marketing tactics. Tim's website is at http://outthinkgroup.com/.