How do i monitor the temperature

Hi, how do i monitore the temperature of my macbook C2D? what is the normal temp of the macbook?
Thanks

Many ways to see those numbers. I use the iStat pro widget:
http://www.apple.com/downloads/dashboard/status/istatpro.html
wich gives a lot of useful info. As for normal operating temperature, some macbooks run cooler than others. My temperature at idle (not start up) is in the low 50s (celsius). Fans start to ramp up in the low 60s, and won't let the temp climb up to more than, say, 78-80, under a very heavy work load.

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