More will be added with time.

Picture and comic books:

The dot and the line: A romance in lower mathematics, by Norton Juster - url=http://www.youtube.com/watch?v=OmSbdvzbOzY]watch the cartoon[/url]

Indexed, by Jessica Hagy of thisisindexed blog

Fiction, stories, fantasy

The number devil, by Hans Enzensberger

Flatland, by Edwin Abbott

Flatterland: Like Flatland, only more so, by Ian Stewart

Research

Where mathematics comes from: How the embodied mind brings mathematics into being, by George Lakoff and Rafael Nuñez

The number sense: How the mind creates mathematics, by Stanislas Dehaene

The origins of mathematical knowledge in childhood, by Catherine Sophian

Godel, Escher, Bach: An eternal golden braid, by Douglas Hofstadter