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lm-sensors appears to have stopped working in Ubuntu Karmic Koala (basically for any distro running Kernel 2.6.31). If you look at your Kernel messages, you will see something like this:

ACPI: I/O resource it87 [0x295-0x296] conflicts with ACPI region IP__
ACPI: Device needs an ACPI driver

If you want to restore the old behaviour (which might be dangerous) add: "acpi_enforce_resources=lax" to the kernel cmdline when booting (or add it in grub.conf to make this permanent).

To add acpi_enforce_resources=lax to your Grub, in Ubuntu Karmic, press Alt + F2, and enter:
gksu gedit /etc/default/grub
And enter the following line:

Then save the file.

If you have an Asus motherboard, chances are good there is an ACPI interface to read your sensors, which is safe.

More info about this: here and here.