I really do think that this could mean the death knell for travel guidebooks as we currently know them!
TripAdvisor Inside™ is a travel wiki. We can all now read, write and edit online travel guides on thousands of destinations around the world. There are no doubt other examples, but TripAdvisor are the big players.
Travellers – and residents – can now collaborate to write travel guides together. One person starts a topic, like “Cancún: Travelling during Hurricane Season” Another person adds to it. Another fixes a couple of typos. Another adds more to it. And shortly you have a travel topic written from the collective wisdom of dozens of people.
Better than an outdated guidebook.