Standards
PDF ISO 32000-1
The ISO 32000-1:2008 PDF open standard was published by the ISO on July 1, 2008. The specification can be freely obtained at Adobe's website:
PDF version of the specification: ISO-32000-1
PDF/A ISO 19005-1
The PDF/A Competence Center is the home of the PDF/A standard. While the actual ISO 19005-1 standard needs to be purchased from ISO and is not freely available, the PDF/A Competence center does host a wealth of technical documents related to PDF/A: PDF/A Technical Documents
XMP
Adobe's Extensible Metadata Platform (XMP) is a labeling technology that allows you to embed data about a file, known as metadata, into the file itself. Current versions of the specification are on Adobe's website:
PDF version of the specification: XMP Developer Center
AIIM References
The Association for Information and Image Management has an excellent collection of links to documents related to PDF standards: PDF Reference Bibliography
Tools
Free online PDF/A validation tool
Links
Pragmatic PDF: Michael Cartwright's blog where ideas for PDF/D are refined
PDF on WikiPedia
PDF/A on WikiPedia
PDF/E on WikiPedia
PDF/UA on WikiPedia
PDF/X on WikiPedia
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