Rename-It

Rename-It! can rename a lot of files easely but also very quickly. It has integration with Windows Shell: Rename the selected items directly from the Explorer Context menu (right mouse click). The renaming is done by filters: Search & Replace (replace a string by another and support regular expressions or wildcards), Case (make the file name uppercase, lowercase, ...), Crop (only keeps a part of the file name), ID3 Tag (for the MP3 files, read the ID3 informations).