I've never made a podcast before, and I'm not very familiar with how they are used. But it seems like it's just a way to present sound and video programs to an audience on the internet.
I actually have a nice video camera (Canon GL2) that I could use to make video podcasts. I think it would be interesting to go to an area of NYC with a large Japanese population and interview them, using whatever Japanese we know. Or perhaps, if this can't be done, then we could interview Japanese students at Columbia. Questions might include: why did you choose to come to New York City for university; do you plan to live in America after you graduate; what are some cultural problems you've had here; have you made many American friends. Since we are only beginners in Japanese and our pronunciation/grammar is bound to be full of errors, I think we should make sure to keep the podcasts somewhat humorous. If they are intended for Japanese university students who are curious about life at an American university, then perhaps we could film some uniquely American/New York City scenes that would surprise a Japanese who hasn't been to America.