Federal Register publishing drives the production of so many agency materials. The new Federal Register offers improved search functionality and an API. Individual articles have a clean, friendly look and feel. Individual paragraphs and headings have their own ID for building links and citations. Rules include links for comments; FR, CFR, USC, and Federal Law references are hyperlinked (this still needs more work); contents are hyperlinked to text headings.
Hats off to GPO for their thoughtful remake -- maybe they could offer workshops on how to better take advantage of their new features.
Agency listing: http://www.federalregister.gov/articles/search?conditions[agency_ids]=466