Skins
1001 Winamp Skins - best skin site
Winamp Central
Amp-Skin.com

MP3 Info
Yahoo MP3 Directory - Good place to start
MP3.com Help - Need help? Get it here

Music
Shoutcast - Best source of streaming music
MP3Spy - Excellent server browser
MP3.com - Dnld/stream unsigned bands

Binary Newsgroups
alt.binaries.sounds.mp3
alt.binaries.sounds.mp3.1990s
alt.binaries.sounds.mp3.1980s
alt.binaries.sounds.mp3.1970s