What can be found in the overlay?

The overlay currently contains ebuilds of moonitor and some ruby stuff.

How to fetch it?

You can fetch the overlay via laymanlayman -f -o http://moonitor.org/moonitor.xml -a moonitor
or do it manuallycd /usr/portage/localgit clone git://moonitor.org/overlay.gitecho "PORTDIR_OVERLAY=\"/usr/portage/local/layman/moonitor\"" >> /etc/make.conf