u can download the sim it in the free flight simulator section in the site menu, after downloading, CREATE a folder in your computer(the name could be orbiter 2006), cause the exe can't lauch in zip file! After creating the folder, place the contents of the zip file you downloaded into the folder you created!
space shuttles are not the only thing u can fly
i downloaded and tried this software months ago, but never liked myself..
Nice pics though.