Customer satisfaction with many of the largest online retailers fell 3% since last year, according to the annual Top 100 Online Retail Satisfaction Index from ForeSee Results and FGI Research. The research, which employs the methodology of the University of Michigan's American Customer Satisfaction Index (ACSI), is based on surveys of over 22,000 visitors to the top 100 e-retail Web sites by sales volume, as reported in the 2009 Internet Retailer Top 500 Guide. This year's aggregate score of 73 indicates online retailers may be dropping the ball.