cpufrequtils : Userspace utilities for the Linux kernel cpufreq subsystem ( http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufrequtils.html )
hibernate-script : Hibernate script supporting multiple suspend methods ( http://www.tuxonice.net/ )
kpowersave : KDE front-end to powersave daemon ( http://powersave.sf.net/ )
pm-utils : Suspend and hibernation utilities ( http://pm-utils.freedesktop.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a rainyday
For Paludis use this rsync : rsync://gentoo.zugaina.org/rainyday-portage
If you have a problem : ycarus(-at-)zugaina.org