Here are a few things I've written specifically about HIVE. You might send him any you think worth the time.

The first is a write up on an article written by Tim Copeland that provides valuable background:
@cryptographic/hive-how-exactly-did-that-happen

The second is an opinion piece, a kind of "customer testimonial":
@cryptographic/one-of-a-kind

And the third is my latest post: a more serious look at HIVE, and kind of primer with references and the like:
@cryptographic/what-makes-hive-different