While looking at this question, I noticed that the "INBOX" heading at the top of the new top bar inbox menu is not linked anywhere:
I'd like to suggest that, like the similar headings in the site switcher menu, it should be a link.
Specifically, I'd like to suggest that it be linked to the network inbox page located at
(It would also be nice if the similar heading on the achievements menu could also be a link, but I don't think there's any page summarizing the network-wide achievements of a user. Maybe there should be?)