The American Express Property Casualty companies today announce auto insurance shopping via the Internet in California. The company is one of the first in the industry to offer a web-based interactive insurance quoting and buying experience. "More than 40 percent of today's auto insurance policyholders are accessing the Internet," said Ken Ciak, president, American Express Property Casualty companies. "This new service lets customers use technology they are familiar with to easily research, comparison shop and purchase auto insurance right from their computer."