Ok, here`s how I do it.
I`m using Wishlist membership plugin (It`s definately worth the investment). The way you set it up is you create pages which have the content on them. Then you set a membership up which allows the content to be drip fed over time (you can set this by day, week, month). When someone signs up they can gain access to any pages you allow them to, then over time other pages become accessible according to how you have set your content to be drip fed. It`s easy.
Another way is to use Aweber. Get the prospect to sign up to a newsletter that is programmed to send an email to the dates you decide. Within the email you can have a link to the content you want to release. This can all be setup and left on autopilot. Once again....easy!
Hope it helps.
http://makemoneyonlineclassroom.com