[eluser]coolfactor[/eluser]
I'm on a Mac, as well. I have a Contextual Menu Item installed called "SymbolicLinker" that gives you the ability to create symlinks from right-click menus. Google it. Very handy thing to have.
Once you have that installed, Put your CodeIgniter system folder where you want it to live, and then when you create a new website, simply right-click on the system folder and choose "Make Symbolic Link". You'll get a file called something like "system symlink". Then just drag that file to where you want it in your new website. Remove the " symlink" off the end, and then just treat it as if it were the real thing. Apache doesn't know any different.
When you go to FTP your files up the server, the real files get uploaded for you. It's almost magical.
(Note: you can not use regular Mac aliases for this. You must use symlinks.)
