Thanks very much, MMissy.
It is HWmonitor, version being developed by Kolzek along with branch of FakeSMC and plugin available here in new software section. Usually just running in menu bar, but if you launch full app from /Applications you can view history graphs as shown. Number of working sensors will depend on hardware and setup, typically should be able to get all cpu cores along with a northbridge and/or other ambient temp sensor, GPU, some fan speeds, cpu frequency and multiplier, Hard drive temps and up to around 9 different voltage readings. Here 2 fans that aren't able to be monitored, and CPU fan 2 and System fan readings drop in and out quite a bit and are not accurate, CPU fan 1 readings are correct although fan is not directly cooling my CPU. Can edit plugins plist to correct some of the voltage gains and rename fans, but have gotten lazy with that lately
Don't know if sensors on my Motherboard - Gigabyte GA-P55-US3L are/would be supported or not... Have been using Lion since almost a year...
Been long time since I touched installing or developing any code-based | derived work.
Would try it out soon, and Let you know. Others would always benefit from our work...
Many thanks to Kolzek for creating an Open Source and dependable alternative to iStat and Bresinks HWMonitor...