Temperature Monitor Alarm

Repurpose a cheap temperature monitor alarm for use as a freezer alarm. Either allow it to be set to a threshold and then beep and/or wifi connectivity for remote monitoring.

Retail $10 each these could be "stocking stuffer" gifts.
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20111018:
This has everything for $220.  Home temperature/humidity monitoring.  Stats to web.  Mobile/smartphone/browser access.

USB Temperature Monitor with Email Alerts $129  Rip off.
raw USB based sensor is $35
USB based package for server room $369

Accsense Wireless Monitoring System.  Complies with FDA, JCAHO AABB, and other industry standards.

HomeSaver Temperature and Freeze Alarm $449

Remote monitoring and control with 6 input zones and 4 output control zones for your vacation home or primary residence. Can control up to 4 heating/cooling zones or other systems.

 Works with standard NO/NC alarm sensors like door and window switches, motion-detectors and moisture sensors. Additional temperature sensors may be added and upper and lower temperature limits may be set individually for each one, allowing the unit to act as a temperature or freeze alarm.

 Remotely query AC power status, temperature, and other sensors at any time - and be alerted when an alarm condition occurs. Rechargeable battery backup...

Retail price for temperature sensor only (no interface) is $20 or $12.  With interface to an "M1" is $71.

AcuRite® 8" Professional Digital Weather Center with Forecast / Temperature / Humidity $40 free shipping

Indoor / outdoor temperature (ºF or ºC)
Indoor / outdoor humidity (%RH)
Temperature trend indicator
Humidity trend indicator
Barometric pressure
Pressure trend indicator