[eluser]pickupman[/eluser]
WanWizard is right, I looked at most of the popular frameworks before, and found CI the easiest to learn. It was a pretty natural process to pickup. They some of the best docs, and active boards around here.
You'll find that you probably won't need separate controllers for what your are doing. Controllers aren't like pages like you would think with plain .php/.html files. They really can do anything. They are the boss that direct traffic. There are some [url="http://ellislab.com/codeigniter/user-guide/overview/appflow.html"]good visuals in the user guide[/url]. I will typically place any similar type of functions/requests into the same controller.
Example:
Pages Controller - adds, edits, deletes, publish/display html content (CMS).
User Controller - login, logout, register, reset password, profile
Cart Controller - view, update, checkout products
