Ignoble Gases nicely describes the mashup between on-line mapping services and digital photography, with a bit of blogging thrown in.
Mapping services now have the capacity to link photographs of a site with its exact latitude and longitude, or exact address. Maps of cities can feature links to photos of the site (other than satellite or aerial photos) submitted by readers, and other descriptive material.
So, geography teachers: Have your kids mapped out your town and put it on the web to encourage tourism? Great discussion topics: What are the advantages of such technologies, and what are the parent-scaring disadvantages, or dangers of them?
I really cannot do justice to the concepts here — read the article at Ignoble Gases.
Posted by Ed Darrell 
Millard Fillmore's Bathtub 