Well, I finally got my first of the time crowns on Perfect Dark (XBOX Live Arcade version).  A lot of time spent on it, but I'm damn happy to have gotten it.

Next task is "The name's Dark, Joanna Dark" crown.  I've just completed Mr. Blonde's Revenge for it - only Maian S.O.S. and WAR! to do and I should have it.  I also discovered that I have earned "Ninja", but I haven't the slightest clue how.
The one that is really bothering me is the "Three Kings".  I don't see how I'm ever meant to complete WAR! in 1:50 as seems to be the general thoughts on the criteria.