Preparing for Mountain Lion - what folders and files should be saved?

Hi gang,
Although some of you make think this is obvious, it really is not. In preparation for Mountain Lion, I curious what folders and files (other than the obvious) should I move off to another drive? I'm going to do a clean install this time around. I'll probably do an upgrade first to understand any gotcha's when I upgrade my wife's MBP later, then do a clean install.
I'm going to move the documents, my Aperture and iPhoto libraries, but I'm unsure about the iTunes folder and my movies and such. Most of my software has come from the App Store, so I don't need to worry aobut those, and the few other programs I have the software for (iWork, iLife, but we'll probably need new versions of those.
I just preparing a list to make sure that I get everthing.
Thanks, Mark

When doing a clean install OS upgrade I like to swap out the time machine drive, storing/retiring the old time machine as a backup of the old system while keeping it's Time Machine history.
So personally what I do is:
#1 clone my boot drive to an external (at this point I have two backups Time Machine + a clone)
#2 wipe the boot drive and install new OS on it (at this point I still have two copies of my data TM + clone)
#3 verifiy the old time machine is accessible from the new boot drive (sometimes due to ownership/permissions/filevault this is a problem so check even if migrating from clone)
#4 selectively migrate files from clone or TM to new install
#5 Start a new time machine of the new OS drive (sometimes I'll wipe the clone at this point and use it, prefering to keep the old TM as a archived backup)
One note, I've burned myself at least once forgetting that I'd excluded some parts of my old drive from Time Machine drive (usually Podcasts, Movies), so pay attention to that before relying on it.

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