I just clicked through Exotica's links. This was the somewhat depressing results:
Mindkiller Systems Dead
Videogames Musics Preservation Archive Dead
The Best Game Music In The World Ever Dead
Hacked Amiga Music Dead
High Voltage Sid Collection Alive
Real Music Alive
Dreamland Dead
Golden Chiptune-Collection Dead
EaglePlayer Official Homepage Dead
Musicline Official Website Moved
Musicline Appreciation Society Dead
Amiga 500 Music Collection Moved
Chiptune Central "Temporarily down"
PlayMod Alive
C64audio.com Alive
Dwango Dead (links to popup hell)
Maybe time to clean up? If you want an undead ftp link, here's one: ftp://ftp.modland.com