I must have missed this one but I visited virtualization.info today and noticed that the Virtualization Congress 2009 will be in the United States in stead of Europe. As you are maybe aware of the 2008 edition scheduled for October was postponed and moved to the U.S. They have a call for papers/presentations and an announcement of the move up on this page: http://www.virtualization.info/2008/12/virtualization-congress-2009-us-call.html.
I was kind of looking forward the the Virtualization Congress and it was unfortunate that they had to reschedule the whole thing. There probably was not enough interest for the Congress in Europe seeing as they needed to cancel it but moving it to the U.S. makes it practically impossible to visit it because of the investment involved.
As far as I know this move makes the upcoming VMworld Europe 2009 the only major virtualization conference over here.