This Lightroom Export Plugin lets you select photos in Lightroom and export them to Photomatix Pro for HDR processing. The plugin also makes it possible to have the HDR tone mapped or fused image automatically saved and re-imported into your Lightroom library.
This short tutorial shows how to use the Lightroom plugin.
The Lightroom plugin is included in the download of Photomatix Pro version 3.1.3 or higher. Please refer to the installation instructions depending on your platform: