Feeware CPU-Z is a program that provides some information on your CPU :

Processor name and vendor
Core stepping and process
Processor package
Processor current core voltage
Internal and external clocks, clock multiplier
Partial overclock detection
Processor features, including supported instructions sets.
L1 and L2 cache informations : location, size, speed, technology.
Motherboard informations : BIOS, chipset, memory, AGP. Waht's New.

New interface, including processors logos.
New CPU support : Cyrix M1 & M2, VIA C3 (Samuel, Samuel2, Ezra, Ezra-T).
New chipsets support : SiS645, SiS735, nVidia nForce series, Intel i440FX/LX, i810/E, i845E, i845G.
Extended Family and Model display.
Bus Speed display (CPU tab).
Southbridge vendor and name (Mainboard tab).
Memory modules information (Memory tab).
Windows version (About tab).
Debugging tools (About tab).

Download CPU-Z v1.14 for Windows 95, 98, Me, NT4, 2000 and XP