You'd think, judging on the name alone, that iSCSI was an Apple product -- perhaps an easier-to-use, shiny, beveled version of the original SCSI? If wishing made it so: sadly, it's only an implementation of SCSI over IP, allowing hosts to connect to remote drives, RAIDs, SANs or tape libraries over standard Ethernet connections. While early iSCSI gear was noticeably slow compared to Fibre Channel and other storage fabric connections, the latest stuff is quite snappy, especially when combined with 10G Ethernet connectivity.
Up until now, the only iSCSI initiators (drivers) available for Mac OS X were paid affairs, usually bundled with hardware or management tools. Now, in advance of the anticipated inclusion of iSCSI with Leopard, the good people at Studio Network Solutions have proffered up a free-as-in-beer version of the globalSAN iSCSI initiator for OS X. No support offered, so download and deploy with caution.