Blinkx software "listens to" and "watches" the video, then inserts text overlay ads based on the spoken words and to some extent, the images in the clip.

FORBES: Magazine Article

Though YouTube began experimenting with clickable overlay ads on videos last year, users aren't likely to click on any ad that interrupts a video, says Forrester's Andrew Frank.

FORBES: Magazine Article

Google has tried inserting overlay ads into videos, and on Tuesday, it launched a new program to distribute ad-laced, commercially produced YouTube video clips to sites through its AdSense network.

FORBES: Magazine Article