I couldn't find my phone last night before retiring to bed. I searched and searched and came to the conclusion that it either got lost at a restaurant or it fell out in the car of my ride. Either way, the uncertainty was worrying and I was not looking forward to trying to hunt it down the next morning.
However, Google Latitude and its history feature to the rescue! https://maps.google.com/locationhistory
. Hey phone, there you are!
I also enjoy the playback feature... Since I work from home I don't often need to leave my neighbourhood but yesterday I (and my phone) were all over the city.