I am trying to complete a project whereby I have copied this tut http://ae.tutsplus.com/tutorials/motion-graphics/create-a-logo-in-the-clouds-animation/
I am trying to make the camera twirl in circles vertically and horizontally. How is this done? Is their any plug-ins?
I am using AE CS3 Pro.
Nope, no plugins that I'm aware of. You need to build a camera rig using 3D null objects. There are a couple of tutorials by Andrew Devis on the Creative COW that have the how-to's. They should be pretty easy to find.
They may be for a later version of AE, but the principle is still the same in AE 8.
If you followed that tutorial you tied the camera to a null. All you have to do is animate the null . Just exactly the same way they did the tutorial but animate rotation on the Y axis.