Everything Left Unsaid

Crosspost requested by the valtyr. Updated on 16 July, 2012, with an expanded section on the nature of the Multiverse.

I'm tsukinofaerii. You may remember me some such posts as... um. Not much actually. I've been quiet lately.

Anyway, I was volunteered by valtyr to make an Info Post, since we're getting an influx of new people and sometimes we rely on jargon the way Tony used transistors back in the 60s. I'm going to put together a brief blurb of the major Marvel Universes and how they relate to Steve/Tony, so if you've been twiddling your thumbs and wondering why Tony suddenly has a brain tumor and a twin brother (that one had me confused for the longest time, urgh), hopefully this will help.

Please forgive me if I'm repeating what you already know, I'm just trying to cover all the bases ever.

WARNING: SPOILERS FOR EVERYTHING EVER HOMG
( Multiverses: What they are and how to use them )
( 616: Behold, the power of transistors. )
( MA: Snakes on a Quinjet! )
( 1610:Do you think this A on my head stands for a chronologically inaccurate slur that is later made fun of in-universe? )
( EMH: Always we will fight as one/Until the battle's won )
Because the Avengers just came out and is not yet legally available for download or on disc, this is going to be slightly more thorough than some of the other universes. Please bear with me. Spoilers are thorough.If you don't want to be spoiled, click here to jump to the next section.
( The Movies: AS;LDFKJGH FULL OF SPOILERS )
( Notable Others )
Hopefully, that was more informative than confusing. Um. Discuss? I'll just crawl back in my hidey-hole.

For the full (1000+) list of canon named and unnamed universes please click here.