Source code is primarily available at the igloocommunity gitweb.
Linux BSP SD card and eMMC images are available from Linux BSP releases page.
Android SD card and eMMC images are available from Android releases page.
Embedded Linux Conference (ELCE) Outside the Box Workshop
The materials from the Outside the Box Workshop (An introduction to Embedded Linux and Hardware Interfacing Using the Snowball Board) can be downloaded from here
The lab notes are also available.