mailman

Looks like Mailman 3.0 is being fleshed out.

The dev page shows some future plans for the tool that are relevent to
our efforts:

http://list.org/devs.html

The 3.0 flesh-out site is:

http://www.zope.org/Members/bwarsaw/MailmanDesignNotes/MailmanThreePointOh

Of particular relevance is the potential for mm3 to leverage zope. It's my
understanding that work is underway to integrate shib/zope. This may offer
some significant out of box integration.

the lists.u.washington login sequence is a simple wayf, if from
u.washington login here else login there. this type of
"enterprise&friends/others" wayf will be a typical user collection
senario.

thinking about the cosign implementation and comparing to pubcookie and
shib, you can think of them as an ever increasing scope of user bases.
pubcookie is single domain, cosign is two domains (enterprise and friends)
both "hosted" but the same site, and shib is a 2 or more solution though
the complexity of shib suggests you better have a lot to justify the work.