Strange, whenever I download this widget, Temperature Monitor shows my trackpad temp sensor spiking like crazy (G4 PB, 1.5GHz, OSX 10.4.8 & 10.4.9) and my computer goes to sleep suddenly and unexpectedly with "PMU received emergency overtemp signal. Going to sleep" in the system.log file. The only way to stop this is to totally remove ministat2 and its .plist file from my hard drive.

I'd advise - steer clear if you're on a PowerBook. Otherwise, go for it!