Tourfilter comes to Chicago. A Website started by Boston concertgoers who were tired of missing shows by their favorite artists, Tourfilter is very simple: type in your favorite bands, and the site will send you an email when the band schedules a Chicago performance. I've already found one upcoming show using the site: punk-folk-acoustic singer-songwriter Stuart Davis performing Friday night at Schubas. (link found at Metafilter)