A FAQ/Resource of the knowledge that gets submitted via our blogs, our code, our recommendations, our solutions. While many submissions are news, a lot is also problem solving and solution sharing.
Think about it - the people contributing here have some of the most valuable grey matter in the world. They are coming up with tomorrow's technology. Obviously not all of them want to share that, but many share their knowledge and experiences in hindsight.
The solutions that HNers implement today filter down into the common practices employed by the masses tomorrow.