VATSIM Pilot Resource Center (PRC)

http://www.vatsim.net/prc/

FlightSim.Com How To's

http://www.flightsim.com/cgi/kds?$=main/m-howto.htm

FergWorld Training & Reference

http://www.fergworld.com/training/

Generic aircraft checklist for use on VATSIM

http://www.flightsim.com/cgi/kds?$=main/howto/checkl2.htm

Learning and Tutorials section contains several learning aids for a wide range of aviation topics

http://www.luizmonteiro.com/Learning.htm

Navigation tutorial devoted to Flight Simulator enthusiasts

http://www.navfltsm.addr.com/index.htm

This is a document written by Kyprianos Biris in Greek language.
To read it you need MS word for Windows

http://library.avsim.net/download.php?DLID=94658