“A picture is worth a thousand words.” A second of video at 24 frames per second must then be worth 24 pictures. Wow…just do the math. A second of video is worth 24,000 words. A thirty second video is nearly a million words. Not exactly…but you do get the picture!
Google’s spider reads words very well. Software is being developed to read images. My Nikon D300 already does this with matrix metering and can read a scene to identify for focus and exposure.
For SEO/SEM, content always rules and words are fun. Firefox 3.5 has built in open source video editing and upload capabilities for Wikipedia!