Re: Setting up a place for externa...
There's a few ways to achieve this. Do you have MobileMe? It's possible to use this, but I'd recommend another Service called DropBox.
Really cool. You can test it out with a free account which provides 2GB storage space.
DropBox is installed on both users machines, you create a free account and invite your friend to share that folder. You can run Dropbox from within the Finder and from the Menu Bar. I haven't used it specifically for Logic collaborations, but have for Keynotes, iWork docs, Final Cut projects... It's great!
Anyway, copy the Logic project folder to your Dropbox folder and as soon as it's ready your friend should be notified that it has been changed/updated/deleted/etc.
I have to admit I tussled with the idea of including DropBox in my Mac OS 201 tutorial... but, I would have been going off on a tangent to the general theme of the tut... You can't please everyone all of the time ;-)