It would be nice to have some sort of advanced query operators to use so we could exclude words and phrases, or use some kind of boolean operators, i.e.:
("this phrase" | "or that phrase") + "and another phrase" !but_not_this_term
Beyond search, though, a really annoying thing is that there's no way (that I've found, at least) to find/manage MY content. I have no way of seeing a list of all Questions & Answers I've asked, answered, or contributed to, for example. And there's no way to turn off the notification emails as far as I can tell. Plus, I'd like to be able to get notification emails about things that I haven't actually participated in. Maybe I'm interested in the discussion but have nothing relevant to say at the moment.
This goes for "Articles", as well. I've posted comments on Articles and I have no idea how to tell if they've been responded to without actually revisiting the article periodically. That's assuming my comment has even been "approved" -- which I have no way of really knowing. I remember once I commented on an article asking a question, and I kept checking back and it seemed my comment never got approved (or at least I wasn't seeing it show up). Eventually I just stopped checking back. I forget which article it even was at this point. And I can't even just search for my name because I guess comments aren't being included in the content when I search articles.