FSDeveloper is a site aimed at developers and those interested in the inner workings of Flight Simulator. Here you will find a large community of like minded devlopers as well as technical articles and software.

http://www.fsdeveloper.com

All you need to know about Microsoft Flight Simulator X

http://www.fsinsider.com

Large number of tutorials to all SDK for CFS3, FS2002 and FS2004.

http://www.scenery.org

FS Recorder is an add-on module for Microsoft Flight Simulator FS2004 and FSX. It allows recording and playback of flights with a lot of fascinating features.
Many thanks to Matthias Neusinger for his very constructive cooperation.

http://www.fs-recorder.net