Heather's comment on my post about always learning was a great example of the principle of sharing group knowledge. As I was writing it, I was thinking "hmm, really should put in something about determining the authority of sources, but maybe that's a post of its own…" and then – cool! – she came back with that bit that was needed to help round out the post.
I encourage you to use tools and conversational techniques that provide an opening for others to weigh in with their knowledge. Blogs with comments on, wikis, giving other people a chance to talk in meetings, asking leading questions when you know someone has knowledge they could share, giving credit where credit is due, all of these are good ways to create better experiences for everyone involved.