In no particular order....

EGR = Exhaust Gas Recirculation
O2 = Oxygen (as in Oxygen Sensor)
TPS = Throttle Position Sensor
Tranny = Transmission
OD = Overdrive
MAF = Mass Air Flow
MAFS = Mass Air Flow Sensor
IAC = Idle Air Control
IAT = Intake Air Temperature
CTS = Coolant Temperature Sensor
CKP = Crankshaft Position Sensor
CMP = Camshaft Position Sensor
RCU = Rear Control Unit
PATS = Passive Anti-Theft System
RAP = Remote Anti-theft Personality
RKE = Remote Keyless Entry
ICP = Integrated Control Panel
CHT = Cylinder Head Temperture
FFV = Flexible Fuel Vehicle
Flex Fuel = Flexible Fuel Vehicle
SRS = Supplemental Restraint System (air bag, active seat belt tensioners, etc.)
ABS = Antilock Braking System