Step 2. Install Source Code control

If you are going to be developing professionally, you NEED to have a source control system installed. While Xcode does not come packaged with a source control system, it does integrate nicely with Subversion.

The following document outlines some of the efforts needed to use subversion with Xcode.

http://developer.apple.com/tools/subversionxcode.html

Note, that this is a far more complicated process for installing subversion than is available elsewhere. You can download a prepackaged subversion that integrates with XCode from:

http://svnbinaries.open.collab.net/servlets/ProjectDocumentList?folderID=164

I pretty much just downloaded that, and ran the package. I then was able to follow the second half of the Apple document to add projects to subversion for management in Xcode.