http://www.medphys.ucl.ac.uk/~martins/orbit/orbit.html Download the manual of this hyper-involved Space Shuttle simulator, even if you can't run the program.
To learn about the shuttle... to learn about space dynamics... to get excited about something that should be on the Mac and you can pester the developers of the program about...
Having never played either of these, can someone tell me just how realistic they are, particularly that Orbiter game. It sounds like fun and I've been weighing up the options for getting a new gaming rig, this might finally tip the balance.