Tombstone, Deleting AD objects , Deleting DNS objects

When an Active Directory object is deleted, a small portion of the object remains for a specified period of time so that other domain controllers that are replicating changes will become aware of the deletion. This period of time is referred to as the "tombstone lifetime" and is configurable.
http://support.microsoft.com/default.aspx?scid=KB;EN-US;258310
http://dnsfunda.blogspot.com/2006_10_01_archive.html

What to do if a DC server die and tombstone life (60 days) ? it is because you will start to get a lot of replication errors. See follow link.
http://www.servernewsgroups.net/group/microsoft.public.windows.server.active_directory/topic18887.aspx
The options are:
1. dcpromo /forceremoval
2. reset the secure channel on the servers
3. restore from the tape and demote the server

We still need WINS even we are in windows 2003 environmnet, see this
http://www.informit.com/articles/article.aspx?p=102617&seqNum=8

DNS detail under _msdcs

dc service include _kerboros and _ldap; it is site specific
domains service include only _ldap; it is not site specific; each domain is identified with a GUID
gc service include _ldap at tcp port 3268; it is also site specific
pdc service only include _ldap at port 389; only one server ( the FSMO pdc-emmulator) provide this service.