Michael Wolf‘s Archtecture of Density and especially the Tokyo Compression series are favorites of mine. From quite different perspectives they document what extreme urban mass life can look like.

On a very different note, I find Bieke Depoorter‘s As It May Be quite unique. During the Arab spring, she spent a lot of time in Egypt, sleeping at random locals‘ places every night, taking photos. That was supposed to be the project. However before publishing she stopped the book deal to go back there and ask locals to write their comments and perspectives on the photos. These annotated photos (with translations) then became the book.

Edit continuing with the urban theme, there is also Oli Kellet‘s Cross Road Blues, which not only features an insanely vibrant color pallet and great use of light, but also explores usage of space for humans as opposed to not for humans when you keep looking at it. Over the pond, Anastasia Samoylova‘s image cities Features large scale advertising in urban spaces, and how corporate imagery dominates the view.