One of the fundamental things you need to understand about Omniture SiteCatalyst is the difference between an s.prop and an eVar, and just what events are and when to set them. They are at the heart of the product and provide the ability to customise it to suit your business needs. If you don't understand the difference, you're going to be in a world of pain, and left dazed and confused. This is, understandably, the most confusing thing to new SiteCatalyst users, and they take a bit of getting used to, especially when you start to combine them all together, but once you understand them, you’ll be on your way to generating custom ones that can really provide insight. Hopefully this post will help out in some small way.