There is a Tumblr called "Women in Marvel". It is focused on female characters in the Marvel universe.
It's a pretty neat blog to follow in general but recently, the admin has undertaken a project. She is reading every appearance (non-cameo) of Black Widow/Natalia Romanova in the 616 continuity. Then she will write up a summaries and analyses.
The first part was posted this week, so if you're interested here is the link:
The Complete History of the Black Widow Part 1:
(The picture included is a cover done by Phil Noto from Black Widow's new, upcoming series. I included it because Phil Noto.)