Opening Spotlight (Default Cmd+Spacebar) and typing any search term brings up the standard Spotlight list of results.
Highlighting a result will bring up a sort of Quick Look or preview window to the left of the search results list.
Pressing the Command key will popup a dialog bar in the bottom of that preview window showing you the 'Last Opened' date. If you continue to hold the Command key, the dialog box will then scroll to show the File Path for the particular result.
Pressing the Option key after the and with the Command key will toggle between 'Last Opened' and the File Path much more quickly.
[crarko adds: When I tried this what I saw was a toggle between the file name and the path. Post your results in the comments please.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20110723100233572