Randy
With the Gatekeeper package you can easily (in 5 min) have both sites running together as if they were one for the users. You can see it in action at
http://www.weg.ee.usyd.edu.au/usyd that has the university iste running in it:
http://www.usyd.edu.au
As of LDAP, I don't think the package was completely ported but there are several threads about it in the bboard
