Do you have an MP3 player? How about a digital picture frame? Some of these devices only play your files in alphabetical order?
iShuffle will enable you to rename your files in random numerical order.
You will have seven options for renaming your files, as well as additional options to remove non-alphanermic characters, dashes, underscores, whitespace, or convert to upper or lower case. iShuffle is extremely easy to use. Just select the drive/folder than contains your files and view the sample reorder. If the sample is what you want, click Finalize and everything is saved.