andrew@sabayon ~ $ eix sabayon-sources
[I] sys-kernel/sabayon-sources [1]
     Available versions:  (~)2.6.20_rc6 (~)2.6.20_rc7 (~)2.6.20 (~)2.6.20-r1 (~)2.6.20-r2 2.6.20-r3
     Installed versions:  2.6.20-r3(01:17:51 PM 03/28/2007)(-build symlink)
     Homepage:            http://dev.gentoo.org/~dsd/genpatches http://www.sabayonlinux.org
     Description:         Full sources including the Gentoo patchset and SabayonLinux ones for the . kernel tree

[1] /usr/portage/local/layman/sabayon
andrew@sabayon ~ $