Interesting: wikitravel.org has been around for a long time, and I wondered if they were somehow related. They don't appear to be, but it is funny that both have a "Destination of the month" as well as an "Off the beaten path" segment on their front page.

I imagine there's a smaller number of people contributing to these wikis than Wikipedia itself, so I hope that they don't end up cannibalising each other in a way.