Principles of audiophile cable construction?

Over the last 2-3 years within the budget I could afford I have been tweaking my system to get the most I could out of sane expenditure. I've been pleased with Teflon cap upgrades, amassed quite a collection of 12AT7/12AU7 vacuum tubes in reaching the same conclusion as most that Telefunken is hard to beat. Now I'm turning my attention to cable upgrades and as I look at what's advertised its my impression that most of whats out there is snake oil technology or cable jewelry. Bear in mind that I'm jaded from having sold audio products in the 80's where it was common for a basic product to be a sound value and the upgraded products to be small tweaks sold at 10 times the additional manufacturer cost. Having a science and product development background I have some opinions on what should be guiding principles of cable design but am not familiar with any site that is a good reference. Ultimately I feel the audiophile cable industry needs the equivalent of an Internet RFC to protect audiophiles from the snake oil and jewelry cable products.

So a request for references: what good sites do you know where they provide competent information on what audiophiles agree on as guiding principles for audiophile quality interconnects?