The typical questions:
"Tell me about [picks random item from your CV]"
"What made you pick your residency program?"
"What aspects of a fellowship program are most important to you?"
"Tell me about an interesting case you saw."
"What's your approach to teaching residents and medical students?"
"Where do you see yourself in [random number of years]?"
"What made you apply to our program, in particular?"
"What made you pick this specialty, in particular?"
"What do you do for fun?"
"How do you think the patients you'd deal with as a fellow here differ from the patients you've had during residency?"
The rare and obnoxious ones:
"Tell me how you lead"
There have been a couple soft feelers trying to gauge how enthused you'd be about relocating to their city.
Honestly, though, most of them are just conversations. Usually it's been an interviewer using the first 5min to introduce themselves (where they came from, why they went into pulmonary, what they're researching/why, why they like the institution), and then they'll typically either ask me to reciprocate or they'll pick one of the above questions. 30min can go by quite quickly once the ball is rolling.
In general, interviews are WAY less painful than they were for residency. It's obvious that they've spent significantly more time reading your packet, they're less exhausted/bored by the interview season, and their interests will, in general, match yours to a greater degree.