http://www.stumbleupon.com/
It is a great way of surfing the net by seeing sites that have interested like-minded folk. Today, for example, it led me to the brilliant photography (yes, they are photos) of Don Hong-Oai. This, in turn, led me to http://www.photoeye.com/ and then on to http://spiral.gallery.sytes.org/...
You could just keep going for ever...
