natch is indeed short for naturally... it's originally a term from a ways back.... Archie & the gang used to say it, and i dont remember what the date on those issues was...
it became adopted to the net, presumably, because it's an abbreviation.
A sticky is a post or thread that a moderator or administrator "sticks" at the top of the page..it doesn't move down the page like other threads do when no one posts to them for awhile. Usually only done to important notices.
ISO - I believe it means "in search of" but here's a thread of discussion about it: http://mothering.com/discussions/sho...242#post166242
EC - Elimination Communication which is parent/infant communication to express the need to go and means no need for diapers.
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