Filed under: Features, WirelessEach week Ross Rubin contributes Switched On, a column about technology, multimedia, and digital entertainment:It's a beautiful afternoon at SeaWorld. You're walking through one exhibit when you spot a group of penguins that look like they're about to break into a number from Happy Feet III: Mumble's Bumble, which you watched with your nephew after you wirelessly downloaded it to your portable video player last week.You shoot some video with the high-definition camcorder pulled from your shirt pocket, press a button, and the video is soon uploaded to your favorite video sharing site. By the time you're out of the exhibit, the little scamp has sent you a video
