I read that Google has begun testing of in-stream video ads by inserting 15-second spots into clips of The Charlie rose Show hosted on Google Video.

The ads now appear after the first three minutes and at about 30 minutes into the hour-long show. Users can't skip ads once they're loaded, but can bypass them before they load. (What's that about?) Previously, ads on Google Videos were restricted to post-roll spots. News of the ads was first reported this weekend by the blog Boing Boing.

Google Video began bolstering its ad sales team back in October. In November 2006, however, Daniel Blackman, Google Video's strategic partner development manager, speaking at an industry conference in New York City, said that the company would be looking into other, less interruptive methods of monetization than in-stream ads. I suppose they did not find any.