Thought I'd start a thread here to list all those useful websites that provide aerial photography and mapping.
Flashearth, sadly not as useful since they removed google from the selection available. Quick and easy to use thou.
Google maps - more up-to-date images generally, but somewhat limited by the small viewing window. Can flick from map view to aerial view nice and easily.
Google earth - same aerial photography as google maps, but you can zoom in further and it runs a bit better. There's lots of handy plugins as well.
Where is that parth or street? A handy display of Google aerial images and OS maps side by side. Best used in the early hours of the morning, as the OSmaps have a maximum of 30,000 views a day by the site, and that gets used up pretty fast by people like us!
Old OS maps overlay in google maps. Very handy for relating old maps to the current landscape. There's also links to several other old mapping sites from this one.
OS maps overlay for Google earth. download this KML file and plug it into Google earth, the result is a transparant overlay of current OS maps over google earth aerial images, really handy tool, and the maps change detail as you zoom in. Again suffers from the 30,000 fetches a day from the OS website.
http://www.brock-family.org/gavin/googl ... smaps.html
Hope you find them useful. Feel free to add others you may know of to this thread.