I'm a PGY-3 in psychiatry and applying for child and adolescent programs currently. There is significantly more interest in our program over the last 3 years. In the PGY-4 class 1/2 of residents are applying to child training and in my class 1/4 of residents are applying for entry after PGY-3 and another 4-5 are likely going to apply for entry following PGY-4. It's creating a problem for the fellowship programs who prefer to keep their internal candidates, not having enough spots to keep everyone.
Regarding where I'm applying, I'm mostly applying to Northeast/NewEngland programs. The question I get asked by everyone - PDs, interviewers, current fellows - is "where else are you applying?" People are dogged in trying to determine where else you are applying, it's rather disconcerting the amount of self-disclosure regarding your thoughts about other programs they push for. My last interview had all 6 applicants sitting around table with chair of department, who then turns to each applicant in turn, asking "where are you applying" and then summarily making comments about program's future, weaknesses, negative comparisons, etc with each of the other programs people admitted to considering. Needless to say, it was very uncomfortable.
That said, I'm not so keen on revealing details of where I'm currently applying. However, I've noticed programs generally tend to believe you will want to remain at your current institutition for fellowship. Other questions that I got asked were
"why consider our program vs. home program?"
future career plans
"how do you think you can make an impact in Child and Adolescent Psych?"
And my very favorite, "do you have any questions for me?"
Good luck