I've written what I hope is a useful Web page about the FSX interface.  It's mostly tables of information I've culled from using FSX and conducting quite a few tests.

I wrote it for novices, but I think it might be useful for veterans as well.  Take a look, and do feel free to let me know whether it's useful.  Feel free to link to it if you like it.

And do let me know what I can do to improve it.

The URL is http://barelybad.com/fsx/fsxintro.htm.