I’m a great fan of a Windows application called ReNamer. The name of the application pretty much says it all. This nifty tool can batch rename files and folders. ReNamer offers various standard renaming procedures, including prefixes, suffixes, replacements, case changes, as well as removing contents of brackets, adding number sequences, changing file extensions, etc..

The program allows you to combine multiple renaming actions as a rule set, applying each action in a logical sequence, which can be saved, loaded, and managed within the program. I use this program to clean up and rename filenames of my photo and mp3 collections. It can be downloaded as installer or as portable software.