Gmail has a new feature that lets you update your email signatures with the location that the email is being sent from. If you travel a lot, this is a pretty neat feature.

To turn this on, you actually have to do two things, both of them are done in the "Settings" of Gmail (the link for Settings is in the upper-right corner of Gmail).

Select the "Labs" tab and find the section called "Location in Signature" (it's currently pretty close to the bottom of the list) and click the "Enabled" option in this section. Then click the "Save Changes" button.

You then need to need to go to "General" tab. In your "Signature" section, there will now be a checkbox under the signature called "Append your location to this signature". Check that box and then click the "Save Changes" button.

Once you do this your signature will be updated to include the location from which the email was sent.