GPS-Info (formerly GPS-Info CMM) is a geotag helper app for Mac OS X. It displays the GPS coordinates of a photo file, and allows you to view that location in Google Earth, Flickr, Panoramio, Google Maps, or MapQuest.
It supports a wide range of photo formats, JPG, TIFF, PSD, RAW...
It can also now launch a GeoFinder search in CDFinder, thus also including your iPhoto database