ClickZ Experts on Paid Search Strategies: "I'm sure some of you would love to get more funds allocated for all types of search marketing, both paid and organic. Pay-per-click (PPC) search return on investment (ROI) is completely under your control, whether directly or through an outside provider. So pitching PPC search to your boss, investors, even the team that would manage the campaigns is fairly easy."

Very interesting article that outlines PPC and natural Search SEO when you're hoping to put this to your boss. Found it very clear, outlining marketing issues and SEO in general I'd not found elsewhere.