CKRename is a handy tool you can use to perform batch file renaming operations.
It provides a three-pane interface: One to select a path, one to display the contents of the current path, and the last to show the effects of the renaming options you've chosen.
You can eliminate file names, insert strings before or after file names, or replace file names completely.
You can also choose to sequentially rename your files, change file extensions, change case, and perform string substitutions. CKRename is very easy to use and, better yet, it's free.
