Is something using a lot of CPU time?  run top, and look at the load
averages at the top right. (number of tasks waiting running/waiting to
run averaged over the last 5/10/15 minutes).

 If it's not close to zero, something's keeping your CPU busy.

 Is your CPU idling at low speed, like it should be?
run cpufreq-info, or if it's not installed, look at /proc/cpuinfo (the clock 
speed there is updated by the kernel's cpufreq framework).  And cat 
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor (ondemand is good, 
userspace is ok too if there is a userspace daemon checking the load and 
deciding what speed to set the CPU to.)

 Core 2 CPUs have a built-in temp sensor that reports a relative temp, relative 
to the max temp.
e.g. on my desktop
$ sensors
coretemp-isa-0000
Adapter: ISA adapter
Core 0:      +59.0°C  (high = +86.0°C, crit = +100.0°C)  

coretemp-isa-0001
Adapter: ISA adapter
Core 1:      +58.0°C  (high = +86.0°C, crit = +100.0°C)  

(sensors is in lm-sensors, and you have to configure it.  You can just modprobe 
coretemp, and do
grep . -n /sys/devices/platform/coretemp.0/temp1_*
(I use grep here as an easy way to combine file names with file contents). I 
get:
/sys/devices/platform/coretemp.0/temp1_crit:1:100000
/sys/devices/platform/coretemp.0/temp1_crit_alarm:1:0
/sys/devices/platform/coretemp.0/temp1_input:1:59000
/sys/devices/platform/coretemp.0/temp1_label:1:Core 0
/sys/devices/platform/coretemp.0/temp1_max:1:86000
)

see bug 264290 for more info about core 2 temp sensors, and a problem
that seemed like it was caused by high temps, but has gone away for me
with 2.6.27-3.

-- 
WARNING: Intrepid might burn down MacBook Pro
https://bugs.launchpad.net/bugs/262550
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