cacls for setting file/share perms
w32tm for checking/setting time parameters
shutdown /r for rebooting yours or another system when windows is "uncooperative"
netdom for resetting windows communications secret passwords
nbtstat for checking cached info
dsadd,dsget,dsmod,dsquery for AD management tasks
dnscmd for updating dns
rpcping for tesing rpc connections
ntdcutil for managing fsmo roles, among other things