Hardware sensors monitor 4.4.0.2 (Feb 2008)
(Shareware, trial period is two weeks)

The most universal hardware monitoring program
for Windows 9X/ME/NT/2000/XP/2003/VISTA x86/x64 editions
This program monitors and displays certain parameters (temperatures,
voltages, fans RPM) taken from h/w sensor chips, installed on smart
motherboards and/or graphics cards. Customizable alarms can be displayed.
Professional license includes thermo control features
(so-called "Software cooling"), nVidia/ATi graphics cards and
HDD S.M.A.R.T. monitoring.
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http://www.hmonitor.com