I've been on the internet for some time, but some of these are new to me:
FTW
The urban dictionary states that it is "for the win", but the reference that I saw didn't make sense for this, well, maybe:
http://wonkette.com/404645/bill-kristol-ftwI think that I want to believe that it is a Fucked up WTF instead (WTF spelled backwards to suggest really being fucked up).
ZOMG
I like the note on this that the Z comes out because the user is attempting to type the shift key and hits the Z instead.