Originally posted by Theo D Lite:
I suppose we can always add:
YMMV - Your Mileage May Vary, used to indicate that just because it works for me here it might not be the same or work at all for you there.
WTF - What the . . . ., well I'm sure you can chose the next word to suit your own sensibilities
ISTR - I Seem To Recall/Remember
IIRC - If I Remember Correctly (sorry if this is a repeat)
One that's probably not netiquette but will be known by fans of Ringworld:
TANJ - There Ain't No Justice