Redundant Array Of Inexpensive Disks
RAID is using smaller disks to make logically larger or more complex storage spaces, by \"striping\" (writing data across multiple disks).
Regrade
Upgrade or Downgrade Line Speed
Regrading a dataline (ISDN/ADSL/SDSL) updates the speed characteristic, changing 512Kb/s to 1Mb/s etc
RrSG
Registrar Stakeholder Group
RSS
Realy Simple Syndication
A web standard method of people collecting content from websites into their RSS reader for viewing later.
Often mentioned in relation to blogs and ipods.