AE Camera Basics

There are at least a few free video tutorials that show you the basics of using the 3D camera in After Effects. Here's a couple:

The Fox Classics Promo tutorial by John Dickinson.

Be A Good Parent To A Camera by Alan Shisko.

Working with Null Objects in AE by Aharon Rabinowitz.

Andrew Kramer has one too, somewhere...maybe iTunes.

Articles by Trish & Chris Meyer -- Camera Control, Part 1: Auto-Orient & Orbit and Camera Control, Part 2: Graph Editor & Dolly Rigs.

Even more 3D basics can be found at 3D made easy in After Effects CS3 by Steve Whatley, AE LiveDocs and the After Effects Design Center.