http://www.ogleearth.com/2006/12/panoramio_wikip.html

if you fire up Google Earth this morning you'll notice a new default layer called "Geographic Web" – made up of three sub layers – Wikipedia, Panoramio, and Best of Google Earth Community.

the Wiki stuff is *very* useful if you are just casually browsing around some American town.

wow. the panoramio integration is very useful is you are browsing around a holiday resort. try a spanish or greek one, and you'll start seeing people's holiday snaps.