Hello Roger,
* Roger D Vargas <luo_hei at yahoo.es>, [2007-06-29 10:38 -0400]:
>  After some research i found why I couldnt use hdd temperature sensor. 
>  Seems that it only works for root. Is there some way to make it work for 
>  unprivileged users too?
Try setting the SUID bit on hddtemp:
chmod 4755 /usr/sbin/hddtemp
ciao,
    ema