Question: what does every e-commerce site need to enable it to sell more merchandise?

If you answered more giant Whoopi Goldberg ads, you're only half right.

What every Google (NASDAQ: GOOG), Yahoo! (NASDAQ: YHOO), Microsoft (NASDAQ: MSFT) and Ebay (NASDAQ: EBAY) needs is better metrics. Why?

Search engine marketing (or SEM) is about paying for traffic. By bidding on keywords, advertisers with Google or its competitors are paying to bring people to their websites. Once there, a website needs to convert traffic into sales. Not an easy thing to do and clearly, some traffic is more valuable than other traffic. The better Google gets at valuating the traffic and providing these metrics to their advertisers, the more profitable everyone becomes. Google makes more money because it optimizes the bidding on keywords by really valuating a click. Advertisers win because they have the tools to bid on the most profitable traffic. For an unbelievable treatise on why analytics are so important, check out Dave McClure's great work on the industry and why investors should take note (Warning: Dave uses some strong language).

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