No article, but it's pretty simple: it's a Wiki that's primary purchase is to be an online travel guide. I'm excited to see how it turns out.
http://en.wikivoyage.org
I'm especially curious to see how it works for smaller destinations. In other words, there aren't travel guides out there for smaller towns and the like, so this could be a really cool way to find things to do in more remote areas.
Anyway, here's the current page on Kansas City to give you the flavor. So far, most of the articles I've read have been a little clunky, but those are the things that get refined over time.
http://en.wikivoyage.org/wiki/Kansas_City