With the new site, there is (understandably, since it's barely even been announced) no tie-in with accounts on the other sites.
If/when account association gets added, it would be nice to add the ability to click a button and have the "UserId" parameter that a lot of the scripts require populate with your UserId for the site in question.
It should be optional, because some people are likely to look at other users' data for whatever reason.