For those of you wondering about Internet facilities, while staying at the conference, I got a reply directly from someone knowledgeable at the Westin:
>> Do you have high-speed (i.e. DSL or cable) Internet access available in the hotel?
YES WE DO HAVE WIRELESS HIGH SPEED INTERNET ARROUND THE HOTEL FOR $ 20 USD PER 24 HRS
>> Is there easy access to the Internet (i) in the main tent ballroom; (ii) in the likely area for coffee breaks; and (iii) in the guest rooms.
YOU CAN USED IN ALL THE AREAS
>> Is there a charge for Internet access?
YES IS $ 2O USD PER 24 HRS, WE HAVE TO PROVIDE YOU THE USER ID AND PASSWORD
So ... there's no escaping from the (wired) world in Cancun. (I'm sure we'll see our share of wireless laptops around the conference).