A few changes on the coast
Travel In’, just south of Mahahual (p. 177), no longer takes reservations by email–rooms are just first-come, first-serve. Considering how nice and cheap the place is, it’s definitely worth taking the bus or a servicio down there first, and working your way back up the road if it’s full. The place now has three rooms (M$100/person), along with space for camping (M$40/person).
Just north of Mahahual, Kailuumcito (p. 177) is now officially called Kailuum (because the original Kailuum, up near Playa del Carmen, closed last summer).
On Isla Mujeres, the hotel listed as Playa Secreto (p. 101) is really Hotel Secreto. My bad. On the same page, the correct URL for Hotel Francis Arlene is www.francisarlene.com.
The website for Rancho Angel (p. 175) near Felipe Carrillo Puerto is now dead, but you can get the info on the Cuzan Guesthouse website (http://www.flyfishmx.com).