A PocketMod is an 8-page booklet made from a single side of paper. This means you can recycle papers that's only been written/printed on one side. See PocketMod.com or this video for instructions to fold the PocketMod.
You can use it to create little books, brochures, handouts, daily planners, or just as a quick notepad or doodling sketchpad.
pgf-pie is a LaTeX package for drawing pie charts (and some interesting variants on pie charts) with the PGF/TikZ graphics package.
The examples in this document are from the pgf-pie manual, version 0.2.
The source code for pgf-pie is available at http://code.google.com/p/pgf-pie/.