In order for a user to mount devices from Konqueror/Nautilus (using HAL), they must be in the "plugdev" group. To add a user to the plugdev group, either use kuser or run the command as root: adduser someuser plugdev I've seen this detail trip up plenty of people before, and something will have to be done about it. After adding your user(s) to the "plugdev" group, you should restore /etc/dbus-1/system.d/hal.conf to its original state. If you don't have a backup copy, you can reinstall the "hal" package and instruct it to discard your changes.
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