Mine

kaustav@localhost ~ $ sudo layman -o http://portato.sf.net/layman.xml -S && layman -o http://portato.sf.net/layman.xml -a portato
* Running command "/usr/bin/svn update "/usr/portage/local/layman/sabayon""...
svn: Failed to add file '/usr/portage/local/layman/sabayon/media-sound/amarok/files/digest-amarok-1.4.4-r3': object of the same name already exists
*
* Success:
* ------
*
* Successfully synchronized overlay "sabayon".
* Failed to add overlay "portato".
* Error was: [Errno 13] Permission denied: '/usr/portage/local/layman/portato'