I would like to know if there's an indicator app that can show the system temperatures (CPU, MB, HDD, etc.). I do have lm-sensors and hddtemp installed so that's no problem, I just need to find a good indicator app.
Does anyone know any good one?
I like System Monitor Indicator, but there are several of them. Have a look at the Ask Ubuntu community wiki on application indicators here. You might prefer System Load Indicator or Hardware Sensors Indicator.
May be interested in installing Conky, and well-configured script? You'll have everything on your desktop, or on The main bar at the Gnome 2.x without Unity.