When they interview in person they rate a phone call
failing phone screens gets you a letter.
I ended up leaving a voice mail thanking him for making the trip, mentioning that the team enjoyed meeting him, we'll keep resume on file and if anything more suitable comes up blah blah blah.
We really do keep all contacts on file - consequently it doesn't do a lot of good to submit again if you got far enough to actually get rejected (rather than ignored) because we just find your previous interview notes read those.
"Whenever you find you are on the side of the majority, it is time to pause and reflect" --Mark Twain
"The significant problems we face cannot be solved at the same level of thinking we were at when we created them." --Albert Einstein
"This is still a dangerous world. It's a world of madmen and uncertainty and potential mental losses." --George W. Bush