More Abbreviations from at AT&T Site:

AAMOF As A Matter Of Fact
AFAIK As Far As I Know
AKA Also Known As
BFN Bye For Now
BRB Be Right Back
BTW By The Way
CU See You
DIIK Darned If I Know
FOAF Friend of a Friend
F2F Face-To-Face
FYI For Your Information
HHOJ Ha Ha Only Joking
IMHO In My Humble Opinion
IMNSHO In My Not So Humble Opinion
IMO In My Opinion
IOW In Other Words
KISS Keep It Simple Stupid
MEGO My Eyes Glaze Over
NRN No Response Necessary
OTOH On The Other Hand
PMJI Pardon My Jumping In
ROTFL Rolling On The Floor Laughing
SO Significant Other
TIA Thanks In Advance