The Mathematics of Chip-Firing
by Caroline J. Klivans

The text is now available.
CRC Press

A review appears here.
MAA book reviews

Below are some chip-firing / sandpile resources.

Introductory material

What is... a Sandpile?

Nautilus The Amazing, Autotuning Sandpile

Numberphile Sandpiles

Pattern Formation

Single source Gallery

Interactive Toppling


Quanta A Fundamental Theory to Model the Mind

The Dollar Game A Game