You are welcome. ;)
The best parts include Cobie Smulders essentially being all of us and proving once again by just how flawlessly amazing she is, Hiddleston mimicking Alan Rickman, Samuel L. Jackson's laugh, and of course Joss Whedon being, well, himself amongst this fabulous cast. Just, the whole thing is brilliant. My only complaint is that it should have been longer.
ETA: Changed link since YT has been taking down all the Avengers stuff, should be viewable now. If not, you can watch this teaser until you can watch the full thing. It is relevant to my subject title, btw.