Garmins slowly getting there mac software running. You can now download their maps to the GPS from the Mac, but they still don't have an Mapsource program yet. Hopefully sometime soon. You can update the firmware via the Mac, there are some others programs that do allow you pull down waypoints and routes from the GPS. If you have the USB Forerunners or EDGE GPS, they do have a mac version of their training center. It's not the same as the windows version, but close.

Their windows software does work well under Parallels, which is what I'm using until they finally get there act together for the mac.