Solaris 10 authentication in an AD world
You can work with a BigAdmin article
Using Kerberos to Authenticate a Solaris 10 OS LDAP Client With Microsoft Active Directory
There is a little disclaimer on the page but it's like ntfs-3g. If it works and is useful, go for it.
I might also suggest you take a look at LikeWise Open. http://www.likewise.com/products/likewise_open/index.php
I use it on roughly 18 Solaris 9 and 10 servers, and another 30-40 Linux servers. Its works fantastically, with very little issues in my environment.