You can enter wireless devices Mac address and find its location its pretty cool.
Of course it doesn't have every devices location.
echo "MAC to Location"
echo "Enter MAC Address"
echo "Example: DE:AD:BE:EF:CA:FE or DE-AD-BE-EF-CA-FE"
echo -n "MAC: "
echo \<h1\> >> results.html
echo $mac >> results.html
echo \</h1\> >> results.html
curl http://samy.pl/mapxss/?mac=$mac |grep "street" >> results.html
echo \<hr /\> >> results.html
echo "If there is no location, invalid MAC or not found"
Just a little script i wrote, makes it easier since you don't have to go to site and do it yourself.
I can't think of any good uses, but its still pretty cool.