This article is about the value of owning domains, but there’s a nice, succinct metaphor in there that would help outline the value proposition of Search Marketing, too:

“Fuel runs an automobile, TRAFFIC is what fuels the net. You can have a million dollar auto but without fuel it won’t be going anywhere on it’s own power. Same with a website. You can spend millions in development but until you add targeted visitors and can CLOSE A SALE you really have nothing. It just sits like the car with no gas.“

Thx Aaron.