Libraryhack 2011 is a competition for Australia and New Zealand developers to access and utilise public library data to generate new applications and functions. Competition details will soon be released on this web site:
http://libraryhack.org/
There is an ideas competition open now:
http://libraryhack.org/ideas/
At my organisation in Melbourne, Australia we are hosting an event from 20 - 21 May 2011 at the State Library of Victoria. For more details, please see the website here:
http://www.slv.vic.gov.au/event/libraryhack