"meta name="ICBM" content="49.205, -122.906"
"meta name="DC.title" content="my eJournal and images"
It's just the longititude and lattitude and an associated name. Now, with the wide spread use of GPS equipment, I'd think the practice would be more widespread. The information can be used in various ways, for example GeoUrl provides easy access to sites near 'my eJournal and images'. Additionally, I found this interesting map and notation which combines site location information with GoogleMaps:
