I hear people in Houston itself are being asked to stay. Over 100 people died in the evacuation of Rita. Those on high ground in the city will probably be ok.
Those on the coast though need to leave. When your weather service claims you will sufferalmostcertain death, it is time to go.
Good luck.
*edit*
From the CNN article linked in the OP:
Residents living in single-family homes in some parts of coastal Texas face "certain death" if they do not heed orders to evacuate ahead of Hurricane Ike's arrival, the National Weather Service said Thursday night.
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