In one of the more interesting evolutionary branches of RFID, tags and applications designed for temperature sensitive environments and products are being adopted in varying degrees (no pun intended).
During recent times, there have been many innovations in temperature sensor development which enabled more sensitive detection, accurate monitoring and real time notification, sensing capabilities of heat sensitive environments.
One such an example on RFID Weblog: http://www.rfid-weblog.com/50226711/the_temperature_sensing_rfid_tag.php
Applicability: it gives the retailer, distributor, restaurant a much better context visibility into the entire chain, thus enabling dispute resolution, better service and compliance etc. Better visibility for it’s own sake is like the ability to observe symptoms without the ability to offer diagnosis or medication.
There may be usage for such diverse areas as blood bank to hospital applications, produce on vehicle monitoring, on shelf monitoring, installation of sensors to ensure compliance. This kind of sensor may also be used for hazardous and safety needs, such as geothermal, utilities and any king of monitoring related to temperature.
Here is a sample video on YouTube from MIT Open Courseware which also discusses such applications of RFID:
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