The conference migrates between countries and continents, the last time was in Europe. Videos from past conferences are here.
Separately, I would like to mention Continuous Integration and Testing cycle conferences - CITCON , these are very open, informal conferences where there are many active people from different countries, many participants are contributors to various OSS solutions on Continuous Integration and Testing. There is no exact information about the future plans of the conference, but their preliminary plan is abiciosen.
CITCON Asia 2012 in Singapore, March 2012
CITCON North America 2012, Spring 2012
CITCON Austrlia / New Zealand 2012, June / July 2012
CITCON Europe 2012, Autumn 2012
The conference site has materials from previous conferences.