A couple of weeks ago, Derek mentioned a Lifehacker story about what people buy online vs. in stores as a part of his weekly roundup of favorite finance news. It was quite an illuminating post since I would have guessed online shopping accounted for a much higher percentage of total retail sales.
As it turns out, the numbers are a bit misleading since the data represents 2007. Certainly in the last couple of years e-commerce has seen significant growth--in fact, in 2009 online sales were 6% of total retail vs. 3.2% in 2007. And according to Techcrunch, e-commerce grew by 11% in 2009 vs. 2.5% increase for retail sales overall.