[SI-LIST] Transmission line impedance

Hi Friends,
   
  Whenever we refer to SI books or application notes, the impedance of the 
transmission line is mentioned as 50-ohms or 60-ohms.  What is the speciffic 
reason behind this value? why can't it be something different than this? OR Why 
this 50-ohms conceptualized from the driver's perspective? (evolution of 
transmission line theory for Digital Design)
  Please flood me some info on this.
   
  Regards,
  Sam
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