I just de-activated the old FGX version 2.2 alpha for downloading from my private fgx server. Meantime I am fixing a lot of bugs and will release a complete new, re-designed and "double-clickable" alpha testing version (2.3pre) for OSX the next days (will also work for OSX >=10.5 now, on Intel). For more advanced users --> Feel free to download recent source from gitorious.org/fgx and compile yourself with qmake/xcode (you need GIT version of FlightGear/SimGear/fgdata to run it, or at least binaries from hudson).
I still need !more! testers and people who wants to help with online wiki documentation (fgx.googlecode.com). Just send me a private message.
Thanks & Cheers, gral