Ask HN: Resources for Managers/Admin

As I have transitioned into more administrative positions, I am longing for a HN-type forum geared toward that niche. I love the articles, people, and discussions here; however, I feel that a lot of the material is no longer relevant to me.

What manager/administrative resources have you found essential -- forums, blogs, books, podcasts? Is there a HN-type forum for those of us who are transitioning to this as part of our careers?