SCSI == Small Computer Systems Interface
iSCSI == Internet Small Computer Systems interface (SCSI being sent over a TCP/IP network)
Fibre Channel (intentionally misspelled to differentiate from "fiber" as in ethernet fiber) == A special super awesome layers 1-3 designed to move SCSI commands better than IP.
SAS == Serial attached scsi. (So you don't have to have big fat 50 pin centronix connectors anymore)
AOE == ata over ethernet. Unlike Fibre Channel (the most expensive protocol over the most expensive network) they attempted to make something that was the cheapest storage protocol over the cheapest network.
FCoE == Fibre channel protocol running over layer 1 and 2 of eithernet with a special layer 3. (so there's no TCP involved). We have these drivers now and expect targets next quarter.