Psensor is a graphical tool which allows you to monitor the temperature of your hardware. It gives information about temperature, voltage and fan speed. The application is very simple, it does not require any settings to change.
To install in Ubuntu 10.10 Maverick, here are the packages:
psensor_0.5.1-2_i386.deb
psensor_0.5.1-2_amd64.deb
And these are the packages for Ubuntu 10.04 Lucid:
