In the UK this is strongly DIScouraged by all the professionals I know.
Over here we have a much more reticent approach to business relationships, and hate people that are too pushy.
If I am offering a job, I want the candidate to stand out in the interview - if I need them to send me a thankyou card after the event to refresh my mind, then they can't have been that good.
Anyone crass enough to send such a card would be guilty of being hideously over-familiar (IMO, naturally), and therefore sending a card would make you less likely to be awarded the job.
If you wanted to be formal about it, wait until after you have been told that you did/did not get the job, and then send a card.
If you got the offer, send a thanks card, and if you failed to get the offer, send a structured letter aking for positive feedback about why a person that must have looked good on paper (your CV/resume got you the interview) was not suitable -- I've had call backs from companies based on this technique that got me invited to interview for subsequent posts before they were advertised; the companies realised that I had qualities that they wanted, even if I didn't fit the post that they originaly called me in for.
For my current job, I was called in for an interview before it was advertised because they had interviewed me for a different post several months earlier, liked me, but not been able to fit me to the role that they had at that time.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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