Google, Inc. (NASDAQ:GOOG) continues to push the boundaries of traditional advertising models, and I think it's just smashed past another one. I never thought I'd see the day when major advertisers like Coca-Cola Co.'s (NYSE:KO) Coke would agree to submit ads that could be attached to content outside its control. But hey, now it's happened.

Google Video is now testing advertisements on user-generated content (UGC) uploaded to Google Video. Google says that Coke has even responded with a made-for-content advertising in order to participate in the test -- a first for a major brand to actually attach itself and its brand name to content created by, gasp, consumers.

This bodes incredibly well for the future of Google's YouTube subsidiary, as the major sticking point in that acquisition was the large looming question on how Google was going to make money on the property without driving away YouTube's existing customer base. If Google can prove with this test that it can get large advertisers to commit to marketing themselves on UGC the YouTube extravaganza may just be the start of a Google-led advertising revolution.