From "Ready, Aim, Shop" in The New York Times:
Though it sounds like slick marketing, Cyber Monday, it turns out, is a legitimate trend. According to Shop.org, a trade group, 77 percent of online retailers reported a substantial sales increase on the Monday after Thanksgiving last year. “Not good for employers,” observed Ed Bussey, senior vice president of marketing at the online lingerie retailer Figleaves.com.
Figleaves.com said sales on Cyber Monday last year were twice those of Black Friday. And that number is likely to jump this year when it offers the online equivalent of a doorbuster – 20 percent off all items.