Mexico is going to get bitch slapped by Dean - twice - first on the Yucatan Peninsula (probably as a cat 4/cat 5 - winds ~140 mph to 165 mph - sustained - closer to 200 mph in gusts), then Dean should hit near Tampico, Mexico after crossing the Yucatan Peninsula.
The second landfall looks like it will be as a strong category 2/category 3 (winds ~100 mph to 125 mph sustained), although it depends exactly how long Dean spends over the Yucatan and then over open waters (these are some of the warmest waters in the world - 86 degrees thousands of feet below the surface) in the Bay of Campache.
Dean is ~ 400 miles in diameter, and will get larger but weaker after each landfall, meaning that south Texas will get ridiculous amounts of rain in a very short period of time, and some wind (maybe 25-50 mph sustained).
Eventually, the moisture of Dean will be ripped apart from the storm itself and enhance Monsoon weather/floods/thunderstorms in West Texas, southern New Mexico, the Mountains of Old Mexico, and Southeastern Arizona. If the track shifted to due West, Dean might actually have enough 'oomph' to cross the entirety of Mexico and emerge in the Pacific, where it would have a brief chance to restrengthen (although it would be a weak tropical storm by that point).
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