First National Bank is offering a 5.50% APY 13-month certificate of deposit. The minimum deposit for this yield is $100,000. A yield if 5.25% APY is available for a $5K minimum. These rates don't seem to be listed at the bank's website. It was advertised in today's Houston Chronicle. The ad is available online here. It was also advertised in the Nov 1st Dallas Morning News and is available online here.
This special CD may not be available at all branches. I've only confirmed that it's available in Houston, Dallas and Austin. The bank also has branches in El Paso, San Antonio, Laredo and Corpus Christi. The bank has been FDIC insured since 1934 (FDIC Certificate # 14318).
Update 11/1/2007: Confirmed that this special is available outside of Houston.