:EDIT: http://en.wikipedia.org/wiki/Block_heater :EDIT:

Hello Everyone
Here are some ideas:
http://www.servicemate.com/catalog/categories.aspx?ParentID=160
Here is the url without the www section:
servicemate.com/nonflash_files/links/engine_block_heater.html

Engine Block Heater

Circulation Heaters

Industrial Tank Heater

Hilton Industries Cordless Engine Heater
Propane Fired
Eliminated Costly Idling

Lower Radiator Hose Heaters
Installs in minutes in non-corrogated lower radiator hose.

Diesel Fuel Heaters

:EDIT:
Basic cheap, off the shelf options.

engine dipstick heater
https://www.google.com/search?q=engine+dipstick+heater&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=MPmXUNOvN6mJywHMooCgBg&biw=1280&bih=883&sei=MvmXUPPUFOaMyAGAlIHgCw

magnetic block heater
https://www.google.com/search?q=magnetic+block+heater&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a

engine block pad heater
https://www.google.com/search?q=engine+block+pad+heater&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=r_iXUIioJOOeywGGn4GwCA&biw=1280&bih=883&sei=sviXUOr5OKr7ygGG8oC4DA

engine block coolant heater
https://www.google.com/search?q=engine+block+coolant+heater&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=9viXUIX-PIeeywHUlICYBQ&biw=1280&bih=883&sei=-viXULj2B8uFyQHtpYGQDA

https://www.google.com/search?q=engine+block+heater&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=V_iXUIWqDsqayQGq5IDwBw&biw=1280&bih=883&sei=WviXULSAB6SayQHTkIDQBw

:EDIT:

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__________________
ASE Master Mechanic
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Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
2003 Volvo V70

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