Recently, I've been toying with the idea of setting up a couple extra services on my guild's Domino server - voice chat, non-Sametime chat, what have you - and I figured I should give a shot to LDAP authentication with the Domino directory for these. However, this is something I've never done, and the documentation is a little rough - most LDAP info on the web refers to non-Domino servers, while most Domino-specific information was written in about 1996.
I'll leave out the depressing details of the various things I tried in my quest to get LDAP working as an authentication mechanism for my Linux server (as a relatively simple test case) and point you instead to this dead-but-still-archived page: http://web.archive.org/web/20040614140723/http://www.dominux.co.uk/ldap.html. The key information on that page is the list of fields that you have to add to your user documents to use them for this purpose. During my harried testing, all /var/log/auth.log was telling me was "Invalid credentials", but what it really meant was that the user account it found didn't have the right attributes. Thanks, Linux!