Quick File Rename is a free tool that lets you quickly rename multiple files just by dragging and dropping them from an Explorer Window. It's simple and small, but power users will probably yearn for a bit more power. It allows you to change the first letter to uppercase, convert all letters to uppercase or lowercase, and change the file extension. You can also replace and remove strings, enumerate files, concatenate strings to the beginning or ending of filenames, and rename/retag MP3 files.
Our Review: Hey this is quite good! If you're sick of_your%20mp3%21s_looking%20like%20this <--- then you need to get Quick File Rename + MP3 Rename. Not only does it automatically let you change the cases of most files, it has advanced features to remove the annoying web-spellings of you MP3s. The interface is simple, all you have to do is drag and drop the icons into the window. Very good!