• Try The Yotsuba Society which has several interesting articles. Oh Jkid, why can't you fix your site…
• For a concise (sparse) 4chan history, check out this site on johnnydigital.com

• tanasiin.info has some info on early and ongoing 2chan/4chan memes if you look hard enough. The rest is the usual VIPPER silliness. In particular, see this.
• There's a big pile of sometimes confusing 2ch flash animation here. (appears broken)
• There is a big pile of sometimes confusing 2ch flash animation here.

• See this page at 4-ch for an explanation of 2-ch terms and a 2-ch navigator
• There's a (likely out-of-date) 2chan navigator in English at bluethree.us

Thanks to Feor for refreshing my memory.

… by the way, it's super creepy that everyone that has any interest in this either has a first name or nickname starting with A.