Andy gave a great answer. From my prospective you need to concentrate on the a newsletter format with three tiers; Silver, Gold, Platinum for example. Give some stuff away for free but think of these as bullet points. You don't want to give so much a way that the user has no interest in "investing" in your premium newsletter, services and products.

I say premium services and products because you should see your website as a checkout stand where people are viewing magazines with tantalizing and scandalous articles. You have to think, "What are my back-end products and services that I have to sell?"
But above all, give them enough for free to get them hooked like a baby with sweet tooth, but not enough to make them fat.

Michael Irvin
NoHogWashMarketing.com
michaelirvin.net