Tracking Shows You've Been to

Interesting (via a Google AdSense ad, no less). In addition to efforts like mine, where I publish information about cool shows, there's also this: http://www.track50.com/. Apparently, Track50 will send you email (if and only if) a musical artist of your choice schedules a show in your area. (Maybe I should stop doing this work? ... I wonder if its general enough to do general notions of events?)