Geograph is an amazing site with thousands of copyright free photos distributed for reuse using the Creative Commons Licence. It even tells you when photos have been taken.
Site Hits: 1,252 today, 129 yesterday, 2,317 this month, 1,775 last month, 249,376 total System Hits: 45,940 today, 86,641 yesterday, 2,940,795 this month, 4,348,457 last month, 1,592,925,349 total