DDS Plugins

Texture Tools for Photoshop
NVIDIA offers a free plugin on their developer site, which includes features for exporting to DDS formats and creating  normal maps.

Download: Texture Tools for Photoshop

GIMP DDS Plugin
The GIMP DDS Plugin allows you to load and save images in DirectDraw Surface (DDS) format.

Download: DDS Plugin on GIMP.org

Other Links

 * DDS Exporting Tutorial
 * DDS File
 * Normal Map Tutorial (Vehicle)
 * Normal Map (Vehicle)