VISualize 2009 is an IDL user group meeting organized by ITT VIS in Washington, DC, scheduled for April 15-16.
Peter Messmer will be talking about GPULib and I will be helping with the hands on demo/training at the end of the day. Plenty of other IDL gurus will be speaking: Liam Gumley, Craig Markwardt, Rob Dimeo, Ronn Kling, and others.
Peter and I will also be hanging out for the second day, discussing ENVI.