directory services feature – copies the directory server settings from teh server to each client image to make a unique CPU Directory Services settings
sharing preferences – allows adding of computer names (hostname/Bonjour name) at runtime
ByHost preferences – by matching the MAC addresses of the clients, you can install clean preferences for each startup client using the Netboot server
Block copy – this is the file format for network image files (older formats supported but you cannot create the older format files with SIU)
automated Network Install & Apple Software Restore
checksums – validate an image by checking the files inside against a known list, making sure the files have not changed