I like the idea of the osu!talks, however I don't like it's format personally. I find it a bit too scripted and not genuine. I would like for it to be more of a talk, rather than an interview. You could feature certain players and analyze different playstyles/mapping styles (of different levels) with the other person (watching replays,or asking mappers to record themselves, etc). You could even 'interview' people who don't speak English by asking them off video(written), and then summarizing information given to you in videos. I think genuine conversations with top players would be a great hit. Perhaps having some footage of osu in the background, for the people who might not like the podcast aspect of it.
Just a few thoughts. Ignore them if they don't fit with you though. You are the content creator after all ^^. I ll post ideas as they come to me.