Hi,
OK, first of all, you need to read the documentation at www.samba-tng.org. Then download the package and follow the documentation.
Samba-TNG is a replacement for an NT PDC. It still only supports x86 architecture, but most systems out there are x86. :D
Some useful links:
Download site: http://download.samba-tng.org/tng/
Documentation site: http://www.samba-tng.org/docs.html
At present, it does not support:
WINS replication
File locking
File ACL support
But apart from that, it is complete.
Hope this is of some help
Nikon