so after using my thinkpad x60 for a while i realized that my battery (brand new) was dying to quickly, to start testing i installed powertop (Gentoo: sys-power/powertop, other : http://www.lesswatts.org/projects/powertop/) and started to notice that there were some changes at the kernel level and other minor tweaks that i could do to maximize on my battery.
Here is the kernel .config tweaked with a good foundation from pappy who is awesome on the Gentoo forums with tweaking out kernels. i recomend that you do a diff between my .config, pappy’s .config, and the .config that comes from portage to see the differences.
at the time of writing, current sys-kernel/gentoo-sources was 3.3.1.
some of the other tweaks that i did (after some googling and using powertop) were :
echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
iwconfig wlan0 power timeout 500ms
which after said and done, when my battery is fully charged it went from about 1.75 hours to 3.5 hours (give or take a couple of minutes).