Linux iSCSI Target Implementation: A Open Source Linux Target implementation by Ardis Technologies.
Linux iSCSI Project: An Open Source driver and daemon for iSCSI on Linux
UNH-iSCSI: An Open Source iSCSI target and initiator project by the University of New Hampshire.
Cisco iSCSI Drivers: Official drivers from Cisco. Get the Solaris initiator here. You must have a customer login to download.
Microsoft iSCSI Home: Micro$osft resources for using iSCSI and iSNS.
IETF IP Storage Charter: The IETF overview of where IP Storage is going and whats in the works. Find all the IETF Drafts here.
IP Storage Network Trends: Your general run of the mill marketing site full of crap, ads, and maybe 1 or 2 useful tidbits.
Linux iSNS Project: An Open Source iSNS Server and Client for Linux (and Windows)
A Technical Overview of iSNS: A decent read on the topic.