it would be very nice if all good tricks from powertop 1.13 would be implemented, (i know was talked before)
also two killer setting i use for greatest power savings:
echo low > /sys/class/drm/card0/device/power_profile for latest radeon(ATI) Xorg driver => finally makes my fan to be quiet, a solution long waiting from 2009 when catalyst drv was not used by me.
grub line, kernel parameter pcie_aspm=force was found as the solution to kernel bug of the power regression (on phoronix site),
Edit: used 64 bits of kernel 3.0.3, Xorg 1.10.4 RC1, radeon 6.14.2 in archlinux
with acpi-cpufreq and ondemand kernel modules. powertop shows the improvements; sometimes as low as 10-15 wake ups per seconds.