Good morning from the west coast!
Interview went well... but here in LA LA LAND, the follow up to the interview is just as, if not more important to the interview itself. Why? Who knows! My guess is to feed the egos of those in positions of power and to emphasize the interviewees enthusiasm/passion (aka desperation!) for the particular position just interviewed for.
Oh and the THANK YOU card... I have never heard of anything so ridiculous! An email I completely understand, but all this stationary formality feels so artificial and obnoxious! But who am I to be a maverick? When in Rome...