4chan historical resources - UNDER CONSTRUCTION
Screencap archive (barely started)
.docx files (not written by me) consisting of extensive summaries and timelines (version 1.4.1, February 2015) [pdf] [jun. 2014] [pdf] [11 mar. 2014] [pdf] [may 2013] and copypasted reminiscences of the site's early days (version May 2013). Yet another earlier version of the whole thing is here.
Mirror of Yotsuba Society's final updated 4chan history timeline (March 2014): [pdf]
/j/ archives garnered by /g/ when they hacked the board sometime in 2011
archive of all banners as of January 2013
nevada-tan fanart collection mirrored from nevada.natural20.net
damaged goods (includes all surviving original threads)
manually archived threads
detailed list of external thread archivers
4chan informational pages rehosted: kimmo emails + april 2006 board changes
The UTV archives (PDF)
External Sites
Stanford Digital Repository mirror of the Yotsuba Society Archives
archive.org from 22 Nov. 2003; only the main page and /b/ can be viewed. /b/ goes back to page 21 (excluding 3-11 and 15), representing posts from 4 Oct. to 10 Oct. (which is when it was separately archived, far as I can tell).
bibanon
world2ch
yotsuba society; their wiki has a really elaborate historical page (still inaccessible as of 2013/08/13, but on archive.org and also bibanon in a dump of the entire wiki)
note: YS archives are no longer being hosted, I'm working on mirroring them at rx. (but see Stanford link above)
tanasinn (not as detailed early on, but recently updated)
old wikiworld page on 4chan (2006/09/04)
mirror of an ancient version of 4chan's wikipedia page
everything shii knows (dead, sadly - though bibanon has a fair number of its relevant articles saved)
macrochan - huge collection of images, many very old
mz images - maybe even bigger collection of old images (at a glance, almost all from 2004-2008)
halcy.de kopipe archive - saved from etherchan.org, and appears to be a different version of the master list than those on tanasinn et al.
user-submitted greentext archive (new)
archived /q/ thread with fairly extensive reminiscences of the older site, plus links to other resources
moot's first PMQ/Q&A on /q/, 9/12/12-9/13/12
moot's second PMQ/Q&A on /q/, 11/18/12-11/19/12
moot's third PMQ/Q&A on /q/, 5/12/13-5/13/13
Jason Scott has 10 million old 4chan threads saved
nevada-tan information and fanart collection suspended, images mirrored here (see above)
another nevada-tan page, this one in Japanese
4chan login pages pastebin from February 2012
/a/'s entries in the 2013 banner contest
4chanlink (service that temporarily mirrors 4chan images on request)