an intresting little trick is the new
GPS-CS1 GPS by sony
http://www.dpreview.com/news/0608/sonygpscs1.jpg
a little gps tracker for photographer, permit to add " where" (and not only "when") to your photo.

look the little demo by sony using the google maps

http://www.sony.jp/products/Consumer/Peripheral/GPS/GPS-CS1K/TryMapView/try.html

(apparently work only in IE)

via :DPREVIEW (http://www.dpreview.com/news/0608/06080202sonygpscs1.asp)