These ebuilds come from http://sabayon.org.
If you have some problems, go to the official site first.
mwf-designer : WinForms Designer for Mono. ( http://www.mono-project.com/WinForms_Designer )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a sabayon
For Paludis use this rsync : rsync://gentoo.zugaina.org/sabayon-portage
If you have a problem : ycarus(-at-)zugaina.org