I recently found the software named hidpoint for USB based Multimedia keyboards/mice. I got my DiNova Cordless desktop working fine. All my multimedia keys working fine. Installation of software is very simple. It has a GUI based Installer.
The software currenlty supports Logitech devices. It supports for ubuntu 6.0.6 , Fedora core 4, fedora core 6, Suse 10.0, Suse 10.1, suse 10.2 , RedHat Enterprise Linux 4.0 and RedHat Enterprise Linux 5.0
You can download software at www.hidpoint.com/download.html
I hope this helps