Even if you only fly flight simulators the best way to do it is like real pilots do. I have discovered this nice set of training videos made available for free on the Angle of attack blog under the name Aviator 90. They are a series of 45 videos (from which 43 have been published so far) which would teach you how to fly like a pro.
They are very similar to the DVD courses that pilots preparing for their VFR or commercial rating can take and they teach you a lot of useful aviation notions from forces acting on a aircraft to flight planning, weather, maneuvers, cross country flying , emergency procedures and many more.
Along side the vast amount of information these videos present, they are also very nicely made with decent graphics and videos taken in FSX which makes watching them a real pleasure.