cairo-dock : Cairo-dock is a fast, responsive, Mac OS X-like dock. ( https://launchpad.net/cairo-dock-core/ )
cairo-dock-plugins : Official plugins for cairo-dock ( https://launchpad.net/cairo-dock-plug-ins/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a desktop-effects
For Paludis use this rsync : rsync://gentoo.zugaina.org/desktop-effects-portage
If you have a problem : ycarus(-at-)zugaina.org