These ebuilds come from http://code.google.com/p/rion-overlay/.
If you have some problems, go to the official site first.
lpmd : Daemon controlling CPU, temperature, power, configurable in Lua ( http://sourceforge.net/projects/lpmd/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a rion
For Paludis use this rsync : rsync://gentoo.zugaina.org/rion-portage
If you have a problem : ycarus(-at-)zugaina.org