Avengers theories

Don't read unless you've seen Avengers, or are willing to read spoilers for two major plot points, including one that comes in the last five minutes of the film. If you'd rather read my not-very-spoilery review at Hypable, it's here.
( Now for the spoilers.  )

You have to jump through some hoops to find the Avengers spoilers

I saw Avengers for the second time last night, and had a chance to think through a few theories I've been pondering since I saw it in NYC 10 days back. Said thoughts, primarily about Loki, Coulson and Fury, are here on my DW journal. THEY CONTAIN SPOILERS. 

YOU ARE WARNED. 

If you want more Hiddleston with less spoilers, I found the interview he did on Univision this morning, where he speaks in reasonably passable Spanish! And my review of Avengers on Hypable is here. 

If you want more Avengers with spoilers, 
( here's a still of Loki and Thor with some text.  )

Feel free to be as spoilery as you want in the comments, btw! Wasn't it an amazing movie?