From cancun travel online site (italics mine):

Just finishing translation of a short briefing issued by Governor of Quintana Roo about Cozumel.

COZUMEL Q.ROO

"The first point of impact in Quintana Roo and for that matter Mexico was the Island Of Cozumel located off the coast of Quintana Roo near the resort destination of Playa Del Carmen. "Wilma" came across Cozumel as a Category 4 Hurricane causing massive devestation according to preliminary information I am receiving"

"The Civil Protection from Quintana Roo is reporting that the winds took down and caused severe damage to houses and businesses including those that had protection and re-inforcement against Hurricanes ."

Additionally Signs, posts, electrical poles were blown away and some vehicles were overturned and swept away as well.

The Principal streets and avenues are flooded with waters of 4 to 5 feet and there are dozens of boats with damage. There was also a that washed almost a mile of highway into the ocean on the "backend of the Island"

As of right now officials in Cozumel have not reported any serious injuries nor deaths.

The highway they are referring to runs along the mostly undeveloped eastern shore that faces the ocean.