GPSPhotoLinker

GPSPhotoLinker is a freeware app for Mac OS X that pretty much does what its name implies. From the website: GPSPhotoLinker can be used to save location and GPS position data to a photo. The latitude and longitude recorded by your GPS unit while you were taking photos can be linked, and saved, to the photos. GPSPhotoLinker automatically enters the city, state, and country annotations into the metadata. I still think of myself as a relative Mac newbie (first Mac was the 1st generation Mac mini). So, my question to Mac expert out there is: Which GPS units are out there for the current generation Intel Macs and do you have opinions of the ones you've used?