Dr. Hardware covers the whole machine and includes not only the common stuff (like processor detection etc.) but also some more sophisticated tests like hardware sensor, IDE/Atapi and network analysis. Also it comes with 7 benchmark tests and provides full support for all 32Bit Windows desktop versions Windows 95, 98, Me, NT4, 2000, 2003 and XP.
http://www.drhardware.de/english/pghpmain.htm