Amarok is an advanced media player for the Linux/KDE platform. Currently Amarok supports a range of portable media devices: Apple's iPod, devices based on iRiver's iFP protocol, devices based on the Creative NJB protocol, as well as usb mass-storage devices.

From version 1.4.4, Amarok includes Rio Karma support. Your distro may package it. If not, you'll need to build from source. Grab the latest source from http://amarok.kde.org/ and follow the build instructions.

Once you've got Amarok built, run it, plug the karma in, mount the second partition (e.g. sda2) somewhere on your system (e.g. /mnt/karma). Then add a new media device in Amarok by going to Settings -> Configure Amarok -> Media Devices -> Add Device. Select "Rio Karma Media Device" as the plugin and enter a name (e.g. "Karma) and the mountpoint for your device (e.g. "/mnt/karma").

And here's some pretty things: