One great thing about the annotated tales over at Surlalune are that Heidi Anne Heiner has included the Grimms' notes with some of them. Not even my complete first edition of Grimm tales has that!
I was reading about Rapunzel and came across this interesting fact: the Grimms had found a version that seems like it blended Bluebeard and Rapunzel. The witch lives with a young girl, and entrusted all of her keys to her, but forbid her to go in a certain room. The young girl, of course, disobeys, and finds the witch sitting in it with "two great horns." Because of that, the girl is placed in a tower.
This tale still seems more reasonable than Bluebeard. The witch, at least, hasn't killed anybody in the process, and really has nothing to hide. And while it's still not entirely fair, at least a child should be expected to obey adults more so than a wife should be expected to have entire rooms in her house off limits.
Still, in both cases, female curiosity is punished. While it's upsetting for feminists, the punishments in both cases (locked in a tower/death) are just so extreme, maybe tales like these were sometimes meant to express frustration with societal expectations of women's complete obedience.
Also, on the subject of Rapunzel...my niece drew this for me for Christmas. My favorite detail is the "no tower" thought bubble coming from Rapunzel. Although many fairy tale Princesses are trapped in towers, servitude, or death-like sleep, their goal is universally escape!