Sage-Combinat started back in 2008, as a reincarnation of a similar project MuPAD-Combinat (MuPAD is nown owned by MathWorks & we switched the underlying platform from MuPAD to Sage). At some point Sage-Combinat was a tightly knit group of about 30 people working together on the core combinatorics feature; this required tight coordination and a common location for sharing in-development code (which was the Sage-Combinat queue).
We want the combinat.sagemath.org website to work for historical reasons: for example, being a part of the Sage CAS, many publications include the website in a citation.
Most pages should redirect to a suitable http://wiki.sagemath.org/combinat page. Check the /misc and /publications folders for publications that we are keeping for the above reasons.