A bit more info on what's happening in Cancun, per cancuntravelonline.com:

"Governor is saying that this is going to register as the worst disaster in Mexico's history with damage and records set.

Some Details:

So Far, 55 centimeters of rain has fallen on Isla Mujeres since 2AM yesterday (a Record).
Stan dumped 36 centimeters and killed 1,500 people in Mexico this month.
In 1997, Paulina dumped 44 centimeters.

Some bad news just in, sorry if I posted it already but I was trying to confirm the information. It is confirmed...

The Caribbean sea crossed the beaches, into the hotels and has met with the lagoon. The road no longer exists as it is now just one big ocean. Worst yet between 3 am and 5 am, the water is expected to rise to 30 feet or 3 stories in the hotel zone, causing obviously unmentionable damages to property there. Again, that is a direct quote from the information passed at the 11PM briefing.

Also, doesn't seem we are getting a break right now. The evacuation of the shelter we talked about is now confirmed that the 2,500 evacuated were tourists. Evacuation was because the ceiling tiles were falling.

All of the shelters, homes, businesses, are taking in water because of the pounding rain hitting the buildings."