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I prefer the in-kernel modules, so here’s how I got them.

sudo apt-get remove powernowd
sudo apt-get install sysfsutils
sudo echo powernow-k8 >> /etc/modules
sudo echo freq_table >> /etc/modules
sudo echo cpufreq_ondemand >> /etc/modules
sudo echo cpufreq_userspace >> /etc/modules
sudo echo devices/system/cpu/cpu0/cpufreq/scaling_governor=ondemand >> /etc/sysfs.conf

All done. If you want to be able to use the Gnome applet to change frequencies/governors, you’ll need to do this: sudo dpkg-reconfigure gnome-applets and answer yes to the question.