This can be very tricky. For authentication of your Web apps, you can try two things. First would be running IIS as your HTTP stack on top of Domino. This is a very complicated setup, which requires an experienced administrator to install and configure properly. Your second option is to try Directory Assistance with your AD as a trusted LDAP directory. I haven't tried option two for ACL lists. I don't know if it will work.
This was first published in May 2002