Here are some of the more common ones. A list of misc.kids acronyms is
maintained by Dave Johnsen <davej@teleport.com>. You can get a copy by
sending Dave a message with the subject "send acronyms". Common acronyms for
soc.culture.jewish may be found in Section 19, Questions 3 and 4 (Part 11).

  B"H			Baruch Hashem (Blessed be G-d) or B'Ezras/Ezer Hashem
			(With G-d's Help)  
  BIL			Brother-in-law
  BTW			By The Way
  CTTS/D		Cute Things They Say/Do
  CYLAH			Consult your local authority on halacha
  CYLAR			Consult your local appropriate rabbi
  CYLOR			Consult your local Orthodox rabbi (offensive to some)
  FAQ			Frequently asked questions.
  FIL			Father-in-law
  FTTS/D		Funny things they Say/Do
  FWIW			For What It's Worth
  FYI			For Your Information
  IMHO			In My Humble Opinion
  IMNSHO		In My Not So Humble Opinion
  IMO			In My Opinion
  MIL			Mother-in-law
  OTOH			On the Other Hand
  ROTFL(OL)		Rolling on the floor laughing (out loud)
  SIL			Sister-in-law
  WTTSW			Weird things they sleep with
  YKYAPW		You know you're a parent when
  YMMV			Your Milage May Vary
  Z"L			Zichrono Livrocho (Of Blessed Memory)