I generally e-mail people I interview afterwards, and call them to let them know the decision. There's a fair few that don't make the cut, particularly when it

I generally e-mail people I interview afterwards, and call them to let them know the decision. There's a fair few that don't make the cut, particularly when it comes to investigations, but they're always good to keep in touch with. I'm also with edw519 on the courtesy front, it's just that in this modern day and age I find that people's attention spans when it comes to job worries are more suited to a quick email than a letter a few days later.