UFPDF: Unicode/UTF-8 extension for FPDF | Steven Wittens - Acko.net
SourceForge.net: TCPDF - PDF class for PHP
fork of fpdf that supports unicode
[cairo] PDF Text Extraction: Past and Present
Summary of font handling in the PDF spec
Adobe: ToUnicode Mapping File Tutorial
Working with UTF-8 in PDF::Writer and Ruby on Rails - Peter Krantz
summary: convert utf8 strings to ye olde shite encoding before passing them into pdf::writer
cairo - rcairo
ruby bindings for the gnome graphics library, including support for generating unicode PDFs
RubyForge: cairo: Project Info
rcairo page on rubyforge
PDF Techniques for Web Content Accessibility Guidelines 1.0
Section "Ensure that all characters codes map reliably to Unicode." descibes an appropriate algorithm for converting all text in a pdf to unicode, regardless of encoding
[cairo] PDF Text Extraction: Past and Present
good overview of how fonts work in PDF files
Adobe Technical Note #5411: ToUnicode Mapping File Tutorial