"I want System Monitor/top/Task Manager for the brain."
(If it could End a Process, all the better.)
Incidentally, I heard about iRhythm recently. A heart monitor that looks like a band-aid, that you wear on your heart. Unfortunately, looking at their site, it looks like it's a prescription device. So I searched for "apple heart rate monitor" and came up with this article about a patent application? Interesting. Oh, looks like someone already made it. That whole Nike+ shebang. Hmm... I wonder if that can be worn (and can collect data) for long periods of time. Anyone tried it?