Challenge!!! So you think you are a hot tech...

[jhay]

First the challenge starts with reading/listening to: A Man on the Moon: The Voyages of the Apollo Astronauts,  available  as an audio book on Audible.com.  Once you start that book, you will be draw into the Apollo Moon program even against your will.  It is compelling.  Then, after you have listened to the drama of the moon program, you get to try it yourself,...sucka...  Here is a realistic sim of the piloting the Lunar Landers.... http://eaglelander3d.com/     Good Luck! 
(Look for my frozen corpse amid the wreckage of a dozen LEM's in the desolate dust)

[Asid]

Awesome.

I really enjoy audio books 

Here is a great free space sim http://orbit.medphys.ucl.ac.uk/

[Attila]

Super Cool

Here my other Lunar Flight sim very hard to fly : http://www.shovsoft.com/lunarflight/?page_id=216