Google Maps previews in mail

http://www.toiyeugoogle.net/2010/06/che-o-xem-truoc-google-maps-trong-thu.html

Official blog post:
http://gmailblog.blogspot.com/2010/06/google-maps-previews-in-gmail-and.html

Too bad, it doesn't create map previews generated by the retired lab feature 'location in signatures'.

Okay, i've noticed... looks like it automagically preview when if its a U.S. address.