I heard about this little program called google globe the other day which lets you zoom in on any part of the world right down to street details. It uses pictures from a satelite in space, its pretty useless after you have looked at all the places you want to but it pretty interesting and it make you realise how much detail the US spy satelites must be able to see.
Its a 11 meg download so if you on broadband it wont take long
http://earth.google.com/download-earth.html