Here's my stab at a few of yours:
FA - For Auction
FAE - For All Ears
TMK - To My Knowledge
And my own (obvious) additions:
AFK - Away From Keyboard
BSOD - Blue Screen Of Death
FPS - First-Person Shooter
FYIFV - F*** You I'm Fully Vested
FUBAR - F***ed Up Beyond All Reason
FUD - Fear, Uncertainty, and Doubt
LOL - Laughing Out Loud
N1 - Nice one (from FPSes)
NS - Nice Shot (from FPSes)
MOTD - Message Of The Day
POD - Priest Of Discord (from Everquest)
STFU - Shut The F*** Up
TMTOWTDI - There's More Than One Way To Do It
WYSIAYG - What You See Is All You Get
And stimulating my passive vocabulary with Jargon File 4.3.1:
1TBS - one True Brace Style
BOFH - Bastard Operator From Hell
DED - Dark-Emitting Diode
FOAF - Friend Of A Friend
GIGO - Garbage In, Garbage Out
HTH - Hope This Helps
IWBNI - It Would Be Nice IF
IYFEG - Insert Your Favorite Ethnic Group
LER - Light-Emitting Resistor
MOTxS - Member Of The <Xxxxx> Sex
OTOH - On The Other Hand
PHB - Pointy-Haired Boss
RSN - Real Soon Now
SIG - Special Interest Group
SO - Significant Other
UCE - Unsolicited Commercial E-Mail
WIMP - Window, Icon, Menu, Pointing device
WIBNI - Wouldn't It Be Nice If
YHBT - You Have Been Trolled
YKYBHTLW - You Know You've Been Hacking Too Long When
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Jeffrey S. Sharp
jss(a)subatomix.com