Here's some PowerShell someone sent me that moves all the contacts in the Active Directory domain contoso.com to the child domain corp.contoso.com:
Get-adobject -ldapfilter "(objectclass=contact)" -SearchBase 'OU=Sales,DC=contoso,DC=com' | move-adobject -TargetPath "OU=Sales,DC=corp,DC=contoso,DC=com" -TargetServer dc1.corp.contoso.com
You need to customize the domains, OUs and target server to make it work of course.
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Mitch Tulloch is an eleven-time recipient of the Microsoft Most Valuable Professional (MVP) award and a widely recognized expert on Windows Server and cloud computing technologies. Mitch is also Senior Editor of WServerNews. For more information about him see http://www.mtit.com.