Vivian Maier is the shit. She is amazing. Long story short, a whole bunch of her negatives (like, 100,00 of them - mostly undeveloped) were sold at auction in 2007 to a chap - he developed and printed her photos and was astonished at the results. Hundreds of beautiful images of people living in (mainly) the '50's and 60's.
Here are some of my favourites - click them to get glorious larger images :)
images taken from: http://www.vivianmaier.com/portfolios/new-york1/ - I love her sneaky self portrait on the bottom left, so sly!
BONUS: There is a doco coming out about her work/life/discovery called Finding Vivian Maier and the preview for it looks amazing. I can't wait.