PDF

Adobe Acrobat SDK
Various downloads for acrobat developers, including sample code and documentation.
http://partners.adobe.com/public/developer/acrobat/sdk/

Cities Digital Solutions Inc.
Offering services to convert your current archives to a text searchable PDF library.
http://00ec95a.netsolstores.com/

Creating PDF Documents for Free
Links to free Web services, freeware applications, and Open Source programs generating PDF files from a variety of other formats. Aimed mainly at Microsoft Windows users.
http://www.pruittfamily.com/paul/freepdf.htm

Decument Engineering Lab
University of Nottingham research group dealing in, among other things, PDF. Papers, research reports on proposed PDF extensions, as well as downloadable and libraries.
http://www.eprg.org/

Fast PDF
Web based tool to convert Microsoft Word documents to PDFs. Free conversion for limited time.
http://www.fastpdf.com

Guru's Lair: Acrobat PDF and SVG Graphics Library
Tutorials and utilities to help use Adobe Acrobat version 4 and above.
http://www.tinaja.com/acrob01.asp

How to Concatenate PDFs without Pain
Article describing several possible techniques to merge two or more PDF files into a single PDF document, with comments on their effectiveness.
http://ansuz.sooke.bc.ca/software/pdf-append.php

html2pdf
A site offering conversion to PDF from HTML documents. Commercial service that can be added to existing websites. Information and examples available.
http://html2pdf.seven49.net

Online PDF to HTML Conversion
Web form translating arbitrary PDF files to HTML, hosted by Adobe. Designed specifically to make PDF accessible to people with disabilities.
http://www.adobe.com/products/acrobat/access_onlinetools.html

PDF Converters
Contains information and resources of free, shareware, and commercial document conversion software.
http://www.pdfconverters.net/

PDF Research Companion
A designer's guide to the Portable Document Format. Provides links, resources, articles, and case studies on Acrobat, Capture and FrameMaker.
http://www.performancegraphics.com/pdfindex.htm

PDFing Mailer
Convert and email AS400 reports in PDF format. Overview of software, downloads, support and contact information.
http://www.pdfing.com/

PDFzone Acrobat PDF Ring
Connects sites showcasing uses of Adobe Acrobat files.
http://e.webring.com/hub?ring=pdfz

Ted Padova's Acrobat Site
Home of the author of Acrobat 5.0 PDF Bible. Contains tips, resources, and publications.
http://www.west.net/~ted/

What is the PDF format good for?
Polemic against PDF, focussing on the format's supposed lack of suitability for on-screen reading.
http://www.complang.tuwien.ac.at/anton/why-not-pdf.html

Adobe to Release PDF for Industry Standardization
Press release outlining Adobe's intention to submit the PDF specifications for ISO standardization. <small>(January 27, 2007)</small>
http://www.adobe.com/aboutadobe/pressroom/pressreleases/200701/012907OpenPDFAIIM.html

PDF - Avoid for On-Screen Reading
Alertbox article by Jacob Nielson discussing the limitations and pitfalls of PDF as an online publishing tool. <small>(June 10, 2001)</small>
http://www.useit.com/alertbox/20010610.html