I was told about JamBase by a friend of mine as a place to find out what shows are around the area. The site is great, they seem to have everything I would want to go and see.

That isn't the cool part.

I clicked deeper into the site and found out that they have an API available for developers. Two grad students from the University of Wisconsin have integrated this API with iTunes so that any artists within your library are matched up with JamBase to determine if any of those bands will be coming through your town. It is called iConcertCal, and it hardly misses anybody that plays in something bigger than a garage. Check it out.