Wes,
You have hit the "high points," with the Project file, the Scratch Disks (Media Cache - a biggie, Render Files - another biggie, and the AutoSaves - not that big), but for the Source Files, everything depends on how you set up your Projects. My general method is outlined in this ARTICLE. Now, there are reasons to do things a bit differently, like locating all Video files on one RAID, Audio on another and probably Exports on another, but if one does set up those folders and sub-folders below a Project folder, then it's basically a three-click Delete, though on separate HDD's.
I also set up my Encore Projects, below the Project folder hierarchy, so with one-click, I can Delete everything, PrPro & Encore, when finished. By doing so, however, I do sacrifice some performance, over splitting things over several HDD's.
Good luck,
Hunt
