Sample File

[Unattended]
OemSkipEula=Yes
KeepPageFile=

[UserData]
ComputerName = *
FullName = “Full Name”
OrgName = “Company”
ProductKey = “XXXXX-XXXXX-XXXXX-XXXXX-XXXXX”

[GuiUnattended]
OEMSkipRegional = 1
OEMSkipWelcome = 1
EMSSkipUnattendProcessing = 1
TimeZone=110

[LicenseFilePrintData]
AutoMode=perseat

[Networking]
InstallDefaultComponents=Yes

[Identification]
JoinWorkgroup=WORKGROUP

Source

http://blogs.artinsoft.net/jose_aguilar_blog/
http://blogs.artinsoft.net/jose_aguilar_blog/archive/2006/07/07/1090.aspx
http://blogs.artinsoft.net/jose_aguilar_blog/archive/2006/09/27/1183.aspx
http://www.geocities.com/kilian0072002/sysprep/sysprep.html
http://www.windowsnetworking.com/articles_tutorials/Creating-Sysprep-Image-Library-Virtual-PC.html
http://searchwinit.techtarget.com/tip/0,289483,sid1_gci1267230,00.html
http://www.dell.com/downloads/global/power/ps1q07-20070193-Altiris-SOE.pdf