James and I demonstrated how to implement iSCSI earlier in the year whilst touring around the UK - many of the audience were keen to find out more. iSCSI is a cool technology as it allows you to share an area of disk on a server to other machines across the network using SCSI as a protocol. You could think of it as "virtual SCSI".
Why may you want to do this? iSCSI can help if you wish to implement a cluster and don't have access to a Storage Area Network (SAN) either because you wish to demo/trail the system OR if you have an abundance of file server storage / no budget for dedicated hardware.
As we showed last year you can implement the server component of iSCSI on Windows Server 2003 either as a storage server or by adding the iSCSI software, the client software can be on either another server or client and is built into Windows Vista.