From Skyshape Software:
MP3 OGG WMA Size Reducer is a universal program for reducing the size of the three most popular lossy audio formats: MP3, OGG Vorbis, WMA (Windows Media Audio). The size of MP3, OGG Vorbis or WMA files can be made two, three, four and even more times smaller, which allows you to upload more music or audio books to your audio player.
With MP3 OGG WMA Size Reducer, all you need to do is add files you want to make smaller, select the bit rate (size, in fact) and click Start.
Try MP3 OGG WMA Size Reducer and you'll see how easy and handy reducing the size of MP3, OGG Vorbis and WMA files can be.
Version 1.10: Now it is possible to add (or drag and drop) folders including subfolders. Added an option to keep the original folder structure in the output folder.
The 'Output location' field now saves the paths previously used. MP3 encoder updated and works faster now.