Here is a new pre-release version of the MAD plug-in for Winamp:
http://www.mars.org/home/rob/proj/mpeg/mad-plugin/in_mad-0.13.1b-pre1.zip
This pre-release has two significant changes, one of which affects sound quality.
Note well: THIS VERSION OF THE PLUG-IN PRODUCES DIFFERENT SOUNDING OUTPUT THAN PREVIOUS VERSIONS. This pre-release uses a new, experimental, dithering algorithm to address the dithering deficiencies of previous versions. It may (hopefully) sound better, or it may not. Please listen to it carefully and post your feedback, positive or negative.
The other change is a new "Streaming" checkbox in the configuration, to enable or disable streaming support. If you prefer to use another plug-in with better streaming support (http/ftp), you can uncheck this while still leaving the MAD plug-in enabled for normal files.
Cheers,