EMarketer is now forecasting that U.S. retail e-commerce sales (excluding travel) will contract by 0.4% in 2009, falling to $133 billion. The good news is that as the economy improves, online sales will return to the double-digit growth rates seen prior to 2008. By 2012, e-commerce sales growth will begin to decline -- resuming another trend seen prior to 2008. This will be due to the inevitable maturation of the e-commerce sales channel, as growth in new online buyers approaches saturation. To find out more about digital marketing and eMarketer's report click here.