This seems very cool and all, but surely 99.99% of regular users have never really thought about seeing their browsing history in a calendar view, or wanted or cared for statistics about it. I am fairly sure a significant proportion of users aren't even totally sure how to access their history - apart from during brief moments of paranoia when they want to keep nefarious things from a partner - and, if they really were looking for something they know they'd seen before, surely they'd just think, "I found this before, I'll just google for it again." (Similarly bookmarks, frankly.)
I guess my point is that this probably appeals to a very small subset of users, but it seems like a massively over-engineered solution for the majority of people, and feels a little bit like the result of trying to answer the question "What can we do that's different?" with a "Wouldn't it be cool if...", rather than solving problems that people genuinely face. Am I being unfair?