====== Auto-logon ======
===== Windows 7 =====
Set the following keys in [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
  "AutoAdminLogon"="1"
  "DefaultUserName"="myname"
  "DefaultPassword"="mypwd"
  "DefaultDomainName"="mydomain"

The domain name entry is not needed for a private LAN with workgroup.

===== Windows Vista =====
Run the following command and uncheck the "Users must enter a user name and password to use this computer" checkbox.
  control userpasswords2