PD Reference card (PDF) – a “cheat sheet”-style document for new and experienced users.
Miller Puckette’s own always-up-to-date HTML documentation for PD (this core documentation is also available in each of the studios in hard copy).
PureData FLOSS Manual – An introduction to PD concepts and function with useful example patches.
Programming Electronic Music in PD (Johannes Kreidler) – A more in-depth approach to PD and its uses and philosophy, “designed for self-study, principally for composers.”
“bang”, the book – “a compilation of texts describing different approaches to pd, a profile of its usage and development.”
The PD Web Ring – A central ancor point for a myriad of sources (of varying use and quality) for PD
Rafael Hernadez’s (aka HDEZ) video tutorials – particularly recommended for new users