PDF Optimization is the process of making sure your PDFs interact well with both EERE's search engine and commercial search engines. Properly optimizing your PDFs helps them perform better in both kinds of search engines, and assures that the search engine results you get on EERE will be clear and easy to read. We have rewritten our PDF Optimization standards to be more clear and concise, and have made a clearer distinction between what's required and what's optional.
The newly rewritten Techniques for Optimizing PDFs for Search Engines provides a succinct explanation of how to write title and subject fields for PDF metadata, and tells you who to contact if you are interested in including the optional fields.
As always, if you have any questions or thoughts about the new standards, feel free to leave a comment!