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If you haven't already read his Amazon No. 1 bestsellers, Video Marketing for Dummies (Wiley) and Roar! Get Heard in the Sales and Marketing Jungle (Wiley), you'll likely catch Kevin Daum sharing his thoughts (and limericks) onstage or on the Web. Humor, he says, is the key ingredient for great communication. An Inc. 500 entrepreneur with a more than $1 billion sales and marketing track record, Daum helps companies communicate in strategic and compelling ways. Subscribe to his column here, or e-mail email@example.com.