Well, you could delete the settings file and have it recreate itself.
Code:
$ kquitapp plasma-desktop
$ rm ~/.kde/share/config/plasma-desktop-appletsrc
$ plasma-desktop &>/dev/null
Or, in one line for easy copy/pasting;
Code:
kquitapp plasma-desktop; rm ~/.kde/share/config/plasma-desktop-appletsrc; plasma-desktop &>/dev/null
Just paste that in a terminal.
edit: As a sidenote, they're adding templates in future versions of Plasma. With those you could just add a Default Panel and it'd look as it did at first login.
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