Cable Manufacturers

Apature Products
AudioQuest
Cardas
Esoteric Audio
Goertz Cables(by Alpha-Core)

Kimber Kable
Music Interface Technologies(MIT)
Monster Cable
Nordost
Straight Wire

Synergistic Research
Tara Labs
Transparent Cable
Tributaries
Wireworld

Cable Guides/Comparisons

John Dunlavy's Usenet Posts on high-end Cable
Wire Shoot Out