I have had two experiences since Sept where I interviewed with familes and then heard nothing back only to run into these parents again down the road.
I have to say that in both cases I had a big sense of relief seeing them again and knowing that they were not interested in my daycare. Sometimes when you see these people again you realize just how much it wouldn't have worked out and that they would not have been a good fit for the daycare. This is especially true when you see them out and about in the community or the 'real world' (not your house) and see how they are and interact with other people and their surroundings and their kids in a different environment.
It helps not to feel rejected because in retrospect you see that things work out just as they should and you can thank your lucky stars that these parents didn't become clients.