Exifsorter is an easy solution for renaming your photos. All pictures of a digital camera can be renamed by this program based on the pictures' metadata (EXIF and IPTC), which are stored in every picture automatically by the camera. The data include information about the date when the picture was taken (year, month, day, hour, second), and also information about camera model, aperture, exposure, picture's size, and many more.
The program can also move or copy the pictures to arbitrary folders. These folders again, can be named according to the EXIF data.