The app Satellite Eyes is a great little addition to any traveler's mac laptop. It automatically figures out your location then fetches map tiles of where you are located at that moment, and makes them your desktop background. It offers several options of mapping, either full satellite photos, terrain maps, simplified black and white line maps, and finally watercolor.
Watercolor is the killer part of the app here. It was already a beautiful option that could be used in interesting ways when added to Open Street Maps a few months ago, but it's truly amazing when you are traveling and you get an unexpected gorgeous desktop out of it like the one pictured above. Last week, I opened my laptop up at the Hotel del Coronado in San Diego, California and took a screenshot. I love it when software offers unexpected delights such as this one and I can't recommend this app enough for those on the go (on a desktop it will never change which is a bit blah).
Oh, and I'm using the app WeatherMin (also download worthy) to display the outside temp on the desktop in the screenshot above.