SED - The Open Group "Single UNIX Specification" man page.
SED FAQ or 'He Sed She Sed' - Dreamwvr.com's alternate frequently asked questions list is arranged in increasing order of difficulty, and can be read as a tutorial.
SED, the Stream Editor - Eric Pement's Cornerstone Mag site hosts FAQs, download sites for most operating systems, list of handy one-liners, table of version differences, and links.
SED Tutorials - Some items selected by Yiorgos Adamopoulos from the Seders grab bag and mailing list.
Custom SED Proposal - Wish list and manifesto for development of a new version of the editor. (May 1, 1998)
