Please tell me what the major advantage is for the Pentium M. Is it just that it has more of a battery life? My understanding between the Pentium M and Pentium 4 M is that the Pentium M has longer battery life when not plugged in and that the Pentium 4 M does not have that long a bettery life when not plugged in, also both of them save some battery power by not usuing all of their functions when not necassary, they both run cooler and with less watts being used. What is the conversion to compare, say a 1.86ghz Pentium M to a Pentium 4 M? Please help me. Thank you.