How do YOU keep track of sales from different traffic sources?
 

I'm looking for the most simple and resourceful way to keep track of sales from different traffic sources, so you know whether or not your turning a profit any particular source.

Also,

is it possible to still keep track if you hide your referring url from your sponsor?

Google analytics -> Goals

Stellar
Sexsearch offers easy keyword tracking w your linking code
ex. sexsearch.com/promocode/keyword

If you mean adult, most programs have a 'Campaign' setup. setup different campaigns for different sites.

right on supz :thumbsup

The NATS campaigns are an easy and effective way to track the effectiveness of your promotions.