High-Dynamic-Range image... a very scientific name for a very simple technique. HDR consist in taking 3 or more pictures of the same subject under different exposures (from the darkest to the lightest) and merging them in one to benefit from a single...

The new HDR and Tone Mapping features of Adobe Photoshop CS5 explained by Julieanne Kost is online on youtube/Photoshop. Learn how to easily work on your HDR batches or create an HDR effect from a single picture !