Programmable Web creates these lists every so often. Their most recent one was from late April: http://blog.programmableweb.com/2012/04/26/49-upcoming-hackath

Programmable Web creates these lists every so often. Their most recent one was from late April: http://blog.programmableweb.com/2012/04/26/49-upcoming-hackathons-local-mongodb-music-science-and-big-data/ http://blog.programmableweb.com/2012/04/26/49-upcoming-hacka...