The Bilderberg Group, Bilderberg conference, or Bilderberg Club is an "off the record" meeting of around 130 transatlantic political and military leaders, business and banking executives, royalty and other power elites. It has been meeting annually since 1954. Despite its influence on postwar history, which arguably eclipses that of the G8 conference, it does not not have a web site and nor does it publicly release records of its meetings.
This year's meeting is stated to be in Greece from 14 May 2009-16 May 2009.
For background on the group's activities, see here