Huge word in Texas (where everything is bigger).... 20130104
The letters are 3000 feet tall and the word is 2.5 miles (4 km) wide. This huge word (someone's name) is 38 miles southeast of Austin, Texas and just north of Smithville. It is at the center of this WikiMapia aerial view. This view is rotated 90 degrees---north is to the left.
To read a brief explanation of the message, click on any of the letters when viewing it in Wikimapia.
For more detail, read this Earth Observatory web page.