Intel Core Duo running temperature

Should I be concerned that my CPU seems to climb and plateau at around 68-71C after an hour or so of usage?
The GPU diode seems to do the same as well.
I have iStat installed which is giving me these figures - is that related?
I also have Norton installed - could that be it?
Sorry - this is just a series of questions....would appreciate some wisdom.
Thanks for reading.

Using the iStat pro widget
My temps are:
CPU A..............40C
GPU.................74C
Ambient..........28C
Memory...........48C
HD Bay............45C
Optical Drive...39C
ST...................43C
Your GPU seem normal, but you should try iStat Pro to double check on that CPU temp reading.
Dennis

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