What's the difference between a Pentium 4 and a Pentium M and which one is better for a Laptop?
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Pentium 4 - Intel's flagship CPU of the time. Sacrificed efficiency in favour of a higher number of clock cycles. Around the 4Ghz mark the design was changed significantly and is now based around the Pentium-M which runs cooler

Pentium M - Originally designed for laptop use (Mobile?). A (heavily) modified version of the pentium 3, optimised for power efficiency. Includes SpeedStep, to slow down the CPU when appropriate to save energy. Some motherboard manufacturers make desktop mobos for use with these chips. Still in development. Very popular

Celeron - Any of a large number of budget x86 processors. Typically either a P3 or P4 with a reduced cache to save costs. The newest ones are based on either the P4 or the Pentium-M

Centrino - The name for Intel's all-in-one mobile system, typically incorporating a Pentium M, Intel chipset and Intel wifi adapter. Used a lot in laptops due to low heat radiance

Pentium M supposedly uses less energy. The M stands for Mobile.

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