WMA - Windows Media Audio - 24 bit 96Khz multi-channel sound.
AAC - APPLE Advanced Audio Codec - audio standard for MPEG-4. Apple iTunes AAC encoder is currently the leader in AAC codec quality having won recent AAC listening tests.
DVD Audio - nice introduction to DVD-Audio (24 bit 96 Khz) & a comparison with SACD, includes links to more DVD-Audio resources.
SACD - high resolution multi channel audio format from Sony.
HDCD - HDCD encodes 20 bits of audio data compared to the normal 16 bit CD format.
DTS - Digital Theatre Sound (20 bit audio) is the high end sound format found on lots of top movies.
Dolby - Dolby Audio (18 bit format) is an almost universal format for surround sound & movie applications.
WinAmp - very popular MP3 player for PCs.
Musicmatch Jukebox - play music, listen to online radio, burn CD's & manage your audio files with this top music player. Site in six languages.
RIM 456 - resources & links to multichannel sound formats, DTS, Dolby, THX, SACD vs DVD-A, digital audio & more.