By all impressions data storage is seeing (and will continue to see) the largest growth in the IT industry. I have been involved in mass data storage including medical data, financial data and much more since 2001. Here are some areas of Storage I have experience with:
.: NetApp
.: EMC
.: Western Scientific
.: Qlogic
.: Brocade
.: Emulex
.: Cybernetics
.: NFS
.: CIFS
.: Fiber Channel (FCP)
.: iSCSI
.: SCSI (direct attached)