It's not quite finished, but I thought some people might like another pre-release of the plug-in for Winamp:
http://www.mars.org/home/rob/proj/mpeg/mad-plugin/in_mad-0.12.3b-pre2.zip
You can at least now turn on (but not configure) the auto attenuation, and I also added some joint stereo statistics. You'll notice some other config options pending too.
This version also detects a special (rare) kind of bitstream corruption and discards the corrupt frames instead of trying to play them.
Cheers, -rob