I fly Flight Sim. I used to fly 98 and now have moved up to 2004 A Century in Flight. I absolutely love flying flight sim. Not to mention, I'm a pretty good sim-pilot.
http://www.simviation.com
This site has many planes, sceneries and extras that you can install and modify. Really useful source.
I've also taken out all of the 'airlines' that FS uses and added my own AI (Artificial Intelligence) airlines. Just adds another spec of realism to the simulator. Real traffic conditions, more ATC traffic and conversations, etc.
You can also become a member of a virtual airline. Some are better suited for beginners and are 'easier' to do. Others are very strict.
Have fun flying. Don't shoot my plane!