I've made some changes to the WPMU LDAP Authentication plugin that's been around (and sent them to Alex to be uploaded to the WPMUDev.org project). I've tweaked some stuff, added some small features, and documented quite a bit of it (as best I could, anyway).
More information can be found here: http://www.thecodelife.net/2007/05/21/wpmu-ldap-plugin-v102/
Enjoy. :)
P.S. I say "early" because Alex has not yet had time to review my changes... things may change. Use at your own risk.
