Voice Mail Compressor
a lucky find by Pierre at Les trouvailles de Pierre
With Voice Mail Compressor, send voice message attachments whose size is 10 to 15 times smaller than a normal WAV file. For example, a 30 seconds message can be as small as 32KB. Click on the "Send" button to use your default email client or click on "Save" to save the file on your hard disk. If you prefer, you can choose MP3 format if you choose on "Set codec" under "Configuration". This software is available with a French interface. (English and others as well)
Be sure to visit Pierre's Lucky Finds (Les trouvailles de Pierre) for more like this