Psensor is a tool to monitor hardware temperature that integrates nicely with Unity by using an Unity Launcher counter which displays the enabled temperatures as well as an appindicator that you can use to take a quick look at all available hardware temperatures or cpu usage.

These days we've got a lot of comments requesting for a temperature monitor applet with Ubuntu AppIndicator support that displays the CPU / Motherboard temperature, Fan speed, etc. on the panel.

Well, great news! Alex Murray has created an Sensors AppIndicator which can display various temperatures and fan speeds as well as the GPU / fan speed for Nvidia graphics cards (if you have installed the "nvidia-settings" package only!).

Indicator-Sensors doesn't have a PPA yet so I've debianized it and uploaded it to the WebUpd8 PPA so you can install it already in Ubuntu 11.04. But please note that Indicator-Sensors is currently in alpha so it may not work for everyone, or you may find bugs. If that happens, report any bugs you may find @ Launchpad.