The move is the latest in the media giant’s battle against YouTube and other viral video sites.
NBC Universal plans to use the weight of its top-rated USA cable network to start the Web site, which will offer a vast archive of TV spots, movie trailers and other "brand-related content," early next year.
The site’s name is a play on the phrase, "Did you see that?"
USA-Sci Fi Channel president Bonnie Hammer said the goal is to "become the go-to destination for on-demand advertising content."
"Didja.com is the logical next step in the changing dynamic between consumers and advertisers," Hammer said. "There's no doubt that commercials are major drivers of pop culture -- all you have to do is check out traffic on any video-sharing site. We want to own that watercooler conversation."
Chris McCumber, senior vice president of marketing and brand strategy for USA, added: "We know people like watching commercials. They just don't like being force-fed at the wrong time."