If you use NuSphere's excellent PhpED IDE then you'll know it has built-in CVS support for source control. This is a guide I wrote to using PhpED with the CVSDude.com service, so you can get your projects up and running in no time at all.

He talks about getting a new project set up, configuring the server correctly in the Project Properties, and running an import for all of the files in your application's directory.

With that all in place, he also helps you set up the reverse - a place to check the files back out to be able to work with them easily (in a few simple steps). There's even shortcuts you can assign to help make running the CVS functions simpler.