comScore released a report on U.S. e-commerce spending for the second quarter of 2007, which showed that non-travel (retail) e-commerce grew 23 percent versus year ago to $27.2 billion, while online travel spending increased 14 percent to $20.3 billion. Total U.S. e-commerce spending climbed 19 percent to $47.5 billion during the period.

"Retail e-commerce rebounded solidly in the second quarter after a modest start to the year," said Gian Fulgoni, chairman of comScore. "After posting 17 percent growth versus year ago in Q1, retail e-commerce sales grew 23 percent year-over-year in Q2, matching the growth rates we've seen during the past couple of years."

The top-gaining e-commerce category in Q2 versus year ago was video games, consoles & accessories, which jumped 159 percent on the strength of Nintendo Wii and PlayStation 3 sales. Sport & fitness also saw substantial gains (up 58 percent), followed by consumer electronics (up 51 percent) and event tickets (up 44 percent).