While reading the docs for PStill (which from the docs looks like a pretty sweet PDF converter), their use of a "Temporary Folder" (/tmp/foldername/) got me thinking. The Finder by default will hide hidden and system files (unless you use Tinkertool to coerce it). Would it show me /tmp if I selected Go -> Go to Folder? Yes, it shows /tmp and all of its ugly contents.

So I dropped the /tmp folder onto my Finder toolbar for easy access. Now I can easily throw all my flotsam and jetsam into /tmp via the toolbar, and the system will delete it for me the next time I reboot.

[Editor's note: Be careful with /tmp; as noted, anything in it will be erased at the next restart. There are no second chances, unlike the trash can!]