http://en.oreilly.com/oscon2009

Now in its eleventh year, OSCON changes scenery, moving to the San Jose Convention Center in San Jose, California July 20-24, 2009, and bringing together over 3,000 experts, visionaries, and hackers in the trenches to explore all that open source has to offer. 2009 promises interesting developments in Linux, Java, Web, and open source infrastructure. OSCON will have tracks for Linux, PHP, Perl, Python, Ruby, Java, Mobile, Databases, Desktop Applications, Web Applications, Administration, Security, People, Business, and Emerging Topics.