There have been a lot of people asking me when they were going to be able to get a copy, the answer is right now.  The Research guys just released it, you can find the download at http://www.worldwidetelescope.org/experienceIt/ExperienceIt.aspx 

There are some neat guided tours included as well.  After I get finished with this event tour, it's going to be a temptation to see if there's a way for me to do a "Tour of the colonies in 2300ad."  Hopefully there will be someone doing a "The path of the Fleet" tour, and I'm SURE the Star Trek guys are going to go nuts with this.