Another 'Sakai and ...' I wonder if folks could use a LDAP gateway to CM / Realms&Groups too. I know that our institution (Stanford) has been unable to deploy a Course Directory, but that service is still greatly desired.
As our deployment contains a clone of the Registrar's data we're in a great position provide an LDAP view into that data.
I bet a lot of smaller institutions may have their Sakai data being the only such repository. Of course they're also probably using webservices to get the data out.
But if we cld give all the stand alone mail tools an LDAP gateway... hmm.