Google has added an interesting option to GMail - you can opt in to have your signature appended with your location. As Wired notes, this might not always be desirable, so you want to be careful about opting in:

The obvious argument is centered around privacy. Sometimes it's trivial, like when you send a note to your boss saying you're sick, only to have your e-mail signature rat you out by announcing that you're sitting behind home plate at the ballpark. More seriously, there's e-stalking and the open invitation to unwanted guests. Also, letting everyone know where you are all the time is just creepy. As a society, we're not ready for that yet.

They note that Latitude (Google's new location awareness for phones) has the ability to broadcast a fake location. Yahoo has similar faking capabilities in their location awareness apps. In the meantime, there are some amusing aspects to this. They determine your location via your IP address. So, if you tie into the network via a VPN, you could get some funny results. I could make it look like I'm located at Cincom corporate HQ pretty easily, for instance :)

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