IBike makes a number of products for cyclists that measure, rather than estimate, various cycling data. IBike offers iPhone- and iPod-based software apps (iBike Dash, shown here) and discrete power meter devices under the iBike Newton brand.
For calling strikes and balls in baseball it would be most entertaining to let the umpire call the play first, and then report what the computer saw. Then the instant replays could be presented to solve the argument. The current problem is that the umps have 25 foot tall egos, which sort of outweighs everybody else.
But I don't watch baseball on television because of all of the commercials. The same for football. Seeing any gave live is fine, but with the delays for commercials it is not so much fun any more. High school games run much faster and they are a much better entertainment value.
Nice slide show, Brian. I particularly liked the BodyMedia and the horse racing camera. I know the horse racing media is older technology, but when you have a horse that's close in the photo, the technology seems amazing. One thing I didn't see was the Kissing Cam. But maybe that's covered by the Sky Cam.