HoudahGeo is sort of the defacto geotagging app for the Mac. Very similar to GeoSetter on Windows, but (unfortunately) not as nice to use.... until now. HoudahGeo Version 3 was just released and it is a huge change. A reworked UI (single window now, one of the best changes), every aspect tweaked for performance, and much more. The only reason I mention it is that I didn't see any notification of the new version when I would check for updates from my old version 2.x version, and if you got your version 2 license after June 2011 you get the version 3 upgrade free.