Geograph - community-driven geography

Data journalist Carl Bialik profiles a fascinating user-driven website that combines photography, geography and big data:

Want to know what a website looked like in the past? The Internet Archive has you covered. But there's no Wayback Machine for the world, and how it looked.

There is, however, one for the British Isles. It is called Geograph, and it contains photos of 97 percent of the 244,034 one-kilometer squares of Great Britain.

In the article he discusses Geograph's history and future plans, interviewing a dozen of the most prolific contributors along the way.

What do you think are some of the best uses for their data set? Would you contribute if Geograph expanded to your area?