This is a simple application that will rename image files based on the EXIF information for when the picture was taken. Having files named IMG_1098.jpg isn't at all ideal especially if you have more then one digital camera and then you start to get repeated file names. This utility application can rename all images found in one folder or all subfolders as well.
You can also easily rename every image in a specific folder by clicking and dragging the folder on top of the program file which acts like a droplet in Photoshop. To get this application to run you just need the .Net 2.0 framework.