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Gig-finding service Bandloop releases a free--and very slick--application in Apple's App Store that helps you find local shows on a map.
A Bandloop developer talks up two aspects of show-tracking that I overlooked: geo-coding of clubs and more listings for obscure local bands and venues.
JamBase is the music fan's standard for tracking gigs, but Bandloop offers a solid competitor. Artists and fans populate and update the show database of more than 50,000 gigs.
Unfortunately, it doesn't offer anything unique, and has less gig information than competitors like JamBase, Bandloop, and iConcertCal.