I haven't downloaded this yet, but I certainly will. If it is accurate and reasonably precise (yea, what does that mean?), I'd like to have it running in the background, gathering data as I work, while also gathering statistics about my work. I, like most of the people here, am a productivity junky. I wonder if a heightened pulse could indicate mounting stress, which necessitates a break. Sure, I have other machinery that could indicate mounting stress -- like my mind -- but the quantitative, off-loaded metric shifts responsibility in a way that could be helpful. "I'm not really stressed," says me to my brain. "No, your heart rate is quite high," says my computer to me.