How do we help one another know who's an expert at what in the community?

We are looking to come up with an easy and zero-budget, preferably self-managing, way to get an overview of topics and themes community members are experts or interested in.

Why? Because this enables us to get in touch with public media outlets and suggest a person from the community to interview when big things happen (which is good PR for them, their work), as well as recommend the right people for speaking engagements/ workshop leaders.

What we have now: a wiki that will quickly become outdated.

If you have any ideas, or event better, are willing to claim this task…tell us in the comments below!