Where are the 'Modern' Directory Services?

MarcQuadra asks: "I've been a Linux user since 1998, and I admin Mac OS X machines at work, but I have yet to find a distribution that comes out-of-the-box with modern directory services. Sure, there are guides to kerberize and set up OpenLDAP, but before I can start pushing Linux as an alternative at work I'll need a few things. Are there any distributions out there that can auto-mount SMB shares as home directories without heavy modification? How about a distro that's based on OpenLDAP and can easily be configured with LDAP-enabled SAMBA and Kerberos? Am I missing something, or is this not a priority with the community at-large?"