If we're expecting members of this community to publicise it effectively, it might be helpful to give them a few tools to use.
One of these is our 'Elevator pitch' which has already been discussed: What is the "Elevator pitch" for Genealogy SE?.
Another might be a succinct explanation of what makes us different from all the other places on the Internet where one can go to get answers to genealogy and family history questions. Why ask here instead of (for example): Yahoo Answers; a specialised mailing list or forum ; the user group for your genealogy software of choice; or the website for a relevant genealogy society. And I'm sure there are other kinds of places to go that I haven't thought of.
So: Why here? What do we offer that other sites don't?