A little more than three months after he lit up the Summer Olympics, Michael Phelps is adding honors and wealth but losing muscle.

Keith Richards

Keith Richards is the new face of Louis Vuitton.

The 64-year-old Richards appeared in his first fashion endorsement on London billboards on Tuesday. Print ads featuring Richards will hit U.S. magazines in March.

Photographed by Annie Leibovitz, the ad shows a haggard looking Richards sitting in a dimly lit hotel room, with a guitar and a Louis Vuitton luggage case. The caption reads, “Some journeys cannot be put into words.”

Being pursued by Microsoft hasn’t deterred Yahoo from its own pursuits of smaller fry.

Yahoo announced yesterday that it had paid $160 million for Maven Networks, a firm that sells video-management systems for online advertising. Maven’s customers include such major media outfits as Gannett, Scripps and Fox News.

Dr. Robert K. Jarvik may play a rower on TV, but he’s not a rower.

And he may not even be the doctor he seems to be in his ubiquitous ads for Lipitor, a cholesterol drug from Pfizer.

Critics of the advertisements point out that Jarvik, the inventor of an artificial heart, is a medical school graduate but not a practicing physician.

Execs from Google and Microsoft are scheduled to appear before the Senate today to argue the merits of Google’s proposed acquisition of DoubleClick.

Google announced the $3.1 billion deal in April, but the plan requires approval of the Federal Trade Commission and regulators abroad.

Google, which last year purchased YouTube for a whopping $1.65 billion, has unveiled a plan to make money from the site.

Ads now appear at the bottom of some videos, eventually disappearing if the users don’t click on them. In an approach similar to Google’s AdSense program, selected content providers receive a portion of the revenues.