There seems to be some curiosity about this game so i figured i would try and help out the community with some recommended addons (although these are just a few)
check out xplane.org(would rather the downloads be here) for downloads there are some great ones out there (v8 airplanes work in v9 as well). there is a Plugin for 5dof, although the new beta supports 5dof native i still use the plugin as it doesnt stutter like stock X
http://www.xpluginsdk.org/pilot_view.htm <--- Plugin Availiable here
Some recommended Aircraft i have gotten (youre taste may vary):Beware of crap planes just wish the fs community would transfer their talents over.
theres a lot more out there
EDIT: Be sure to download the Updater and get the beta!
"WHEN YOU GRAB THESE UPDATERS, BE SURE TO GO TO THE 'OPTIONS' SCREEN IN THE INSTALLER AND CHECK THE BOX TO DOWNLOAD BETAS! (Do this by clicking on the word 'OPTIONS' in the bottom of the installer opening window)."