I'm a big fan of black and white photography. Without the distraction of colours, it seems to me that you look more deeply at the image. Anyway, any site predicated on black and white photos is good; this one, called "Someone Once Told Me", is even better, not least because most images were shot in London:
Black and white photographs
A new one every day
Each person writes a message
Of something that someone once told them
What did someone tell you?
The short, untethered messages are positively surreal.
Just one problem: all the images are
copyright SOTM ©2008
This is a site crying out to be shared freely. Perhaps someone should tell its creator about Creative Commons licences... (Via Londonist.)