well i have a dell inspiron 1100. the problems about overheating with this model and the 5100 are widely documented and known by dell but they do not do anything about it.
the fan is placed on the bottom of the laptop and sucks air inwards, blows it over a heatpipe and back out over a heatsink. it is known as a "vacuum fan" nowadays
the official line from dell regarding my lappy is to take it apart once a month, remove the heatsink/heatpipe/fan combo, and clean it out. this is because the heatsink becomes clogged with dust bunnies that are positively monster-sized. wouldnt surprise me if this voids the guarantee but it is a bad design flaw. maybe it is the same on your toshiba, dust is being sucked up clogging the airflow and causing heat to build up?
before dust treatment, my processor reaches anything up to 70C (it shuts off automatically at this temperature), but after treatment hovers around 45-50C when doing load-intensive stuff in photoshop.
so, check your heatink and invest in a screwdriver and compressed air
solution to my problem is here by the way >>
http://forums.us.dell.com/supportfor...sage.id=147208