Sensor's View Pro. Try it out for free.....it is cheap to buy, and you get free upgrades forever after buying it once. I was using the old version when version 3.1 came out....an Email got me a new serial#.
Of course it measures all temperatures, and fan speeds, runs a chart to show the changes......but it can also show CPU usage, memory usage, HD usage, and network activity, and give warnings about high temps.
I like the look of the thing.....it's the best-looking program out there. You can remove the background so just the numbers show, change all the colors, etc. In any case...try it out for free.
One thing to watch out for......many of these sensor monitoring programs will conflict with each other if you run them at the same time. My LIS2 fan controller requires Speedfan be running to operate properly........I can run Speedfan and Sensor'sView at the same time without problems. And I do because of the Sensor'sView interface(it's so pretty/useful).