An excellent collection of images titled “Best Pictures of 2003” (sample on the left) is here. Few images, but very spectacular.
Earth Science Picture of the Day – daily updated web site with high quality images devoted to Earth’s nature wonders (sample on the right). Archives are available upto year 2000. Much to see.
And in order to desaturate some of those excellent colors, here is a website devoted to black and white photography of New York and London.