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Thermal Imaging is one more service we offer.  We use a Compix PC2000 imaging system which is similar to the one you can see here. This process very effectively shows hot spots.  It is very useful for verifying thermal performance of PCBs, particularly power supplies and other circuits dealing with significant amounts of power.  It also catches the occasional whoops when a component is improperly sized as shown in the image below.  This engineer failed to notice he was dissipating about 1/2 W in a 1/8 W surface mount resistor in a fairly simple LED driver circuit (sorry Greg).

The excess power dissipation was not noticed during board turn on due to the fact that it was a very small point heat source.

Here is an example of another typical use imaging the thermal profile of a multichannel switching supply: