I've seen several hints on this site lately about using Front Row to watch movies stored in locations other than the ~/Movies folder, but most are limited to adding one additional location to Front Row's menu. Here is a fairly simple trick that allows you to browse to and play any QuickTime-compatible movie located in any folder, including internal, external, and removable disks.
First, use Tinker Tool (or your other tool of choice, or Terminal as in this hint) to view the hidden folders on your computer. Then locate the /Volumes folder (which was previously hidden) in your root folder. Command-option-drag the /Volumes folder into your user's Movies folder. Finally, re-hide your hidden folders.
Launch Front Row and browse to the Movies category. There should be an entry at or near the bottom called Volumes. Select it, and you will see all of your mounted disks, including hard drives, CDs, DVDs, and networked drives.
[robg adds: You don't need to show hidden files to make this hint work. Instead, hit Shift-Command-G (Go to Folder) in the Finder and just enter /Volumes. The Volumes folder will show up, even though it's still marked as invisible.]

