UPDATED: File Renamer v2.2
File Renamer will rename the files of the selected tracks (or the files of the tracks in the selected playlist) with a filename pattern that is formulated using the tracks' tag data. Optionally, export a copy of the files to a chosen location and rename the files in that location.
This latest version fixes a problem with escaping file path delimiters, fixes an issue with closing the Preview window, and has other minor fixes and enhancements.
You can download it here.