Jakarta SP2 (Score 1)

We sell clusters, many of them I include an SP2 temperature sensing device. http://www.jacarta.co.uk/products/prod_sp.html This can detect temperature (duh) and other things, like water or contact sensors. The sp2 has 2 sensors, you can get more others. The sp8 may be more your thing. The sp2 can email, snmp trap sms etc. etc. etc. on configurable limits, a warning and an alarm. You can also query it via snmp (what I do) and web pages etc. where you get a history of the temperature. Personally, I use one temperature sensor in my server room. I also connect one to the clusters, I use email warnings if the room goes too high, and can shut down the cluster nodes if it gets serious.