Flickr users broke the 10 millions geotagged photo milestone few days ago.
This is already impressive given the manual process users have to go through (drag and drop the pictures on the map or using Picassa + Google Earth + Flickr upload for example).
As GPS + Bluetooth chips are coming soon for 1$ it is obvious that future mobiles phones and camera will automatically and accurately geotag and date all the pictures we take.
As more and and more people share their pictures on site like Flickr our history will be able for data-mining in a way historians never had before. Also as folksonomy continue to spread the meta-data available improve the usefulness of these data.
For an historian looking at the 21st century it will be much easier to understand how a place changed though time (environment, architecture, wealth, etc.) or find the evolution of particular objects or see any important events through the eyes of their witnesses.
All this is possible thanks to amateurs tagging and geotagging their contents in a public way which can be mutualized by sites and API like Flickr.
Oh by the way ... amateurs can also then access these data to become historians ...
Other links:
Geotagged pictures on Flickr
My geotagged pictures on Flickr
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