Of all the interesting people I have met during my time here at IFTF, Gary Wolf ranks way up there.  A contributing editor at Wired, he and his colleague, Kevin Kelly, have been developing the idea of the quanitifed self for at least the last couple of years.  They maintain a website devoted to the subject, and hold monthly meet-ups in the San Francisco Bay Area to bring together others interested in various forms of self-monitoring and data collection about oneself.