There is a program called "Open Terminal Here" that you can put in your Finder window toolbars, or you could drag a directory to the terminal to get the path that way.
Look on VersionTracker. There is a context menu item you can download for free that does just that. It will copy either the Unix path or HFS path, depending on which you choose. Very handy. I think it's called 'Copy Path'.
cool... i definately think we need a "show full path" option in the search window or elsewhere that can be copied... i'm tired of retyping links to this and that!
There's also Contextual Menu Module (CMM) plugin for the Finder which provides an option to open Terminal.app already set to the folder you are working with in the Finder.