Where You At?
You probably don't want to delve to deeply into the potential invasion-of-privacy issues, but recent developments are now allowing browsers to access your position, much like a GPS enabled phone browser - meaning websites such as Last Minute's Radar can provide you with location-centric data.
Google's Gears is one way of enabling such services, recent builds of Firefox include similar tech.
21st Nov 2008 - Tumblr