CopyPath is a simple app, designed to live in the finder toolbar. When the button is pressed it copies the full path of all selected folders and files to the clipboard, taking the hassle out of getting file paths.
Well, I don't review this cos I'm reluctant to the MacAppStore, but I've found PathSnagger (http://www.macupdate.com/app/mac/13623/pathsnagger), that's doing the same job as a service, without cluttering your menu bar... and works perfectly on 10.6.x