Amazon.com founder Jeff Bezos and Salesforce.com founder Marc Benioff invested around $3 million in ZocDoc, a service for making medical appointments on the Web. Their money joins Sun Microsystems cofounder Vinod Khosla's, who led ZocDoc's $3 million first round. "We're looking for wealthy individuals to invest and not just institutional money," ZocDoc CEO Cyrus Massoumi said. How nice to be choosey. [SAI ]