MFM Release versions explanation.
"NET" folder: lagacy .msi installers for Windows.
"Mono" folder: lagacy binaries working under Mono.
"Experimental" folder: latest and progressive features, but might be little unstable. Litle "r" indicates SVN revision number.
I recommend to you to use Experimental branch. =)
FFmpeg Windows builds: http://ffmpeg.zeranoe.com/builds/
Libav Win32 autobuilds: http://win32.libav.org/win32/
qaac home: https://sites.google.com/site/qaacpage/
GPAC (MP4Box) builds: http://gpac.wp.mines-telecom.fr/downloads/gpac-nightly-builds/