No official application yet though if the device is popular enough an official one will probably be made. I believe there are unofficial ones that were worked on for the n800/n810 that were never completed due to logistics (e.g. when would the device send info if it's not always connected) or the n800 doesn't have a GPS built in. Shouldn't be to hard with openssh access + terminal you can pretty much control the entire device from afar. And any bash script that would output the GPS location every X minutes or whatever. It's the desktop/laptop end that you would have to figure out. There's nothing like MobileMe where it will show you and give you a nice GUI to use.