The MSRI Summer School - Reed College, July 13 - July 26, 2003
Lecture 2 on PostScript
Continuation ... (more of Chapters 3, 5 and also parts of Chapters 6, 8). You should also keep handy a copy of Appendix 1, a description of all important PostScript commands.
Adobe's PostScript reference manual
(a .pdf file of about 7Mb)