Here is a very quick method to find the path of a file or folder. Press Command-Option-Space to open an empty Spotlight Results window. Drag the file or folder whose path you'd like to copy to the Search box in the Spotlight Results window. Copy the resulting path. That's it.
[robg adds: Works as described!]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20071018002311820