With some quick disconnects and plumbing fittings, I bet a guy could tie one of these into the cooling system and fire it up in cold temperatures. Keep it in the trunk until it gets cold, connect it up, heat up the coolant. I wonder how long it would take to get the coolant to the same temperature as an electic block heater reaches?

http://cgi.ebay.com/Coleman-Hot-Water-On-Demand-Portable-Water-Heater_W0QQitemZ190189201767QQihZ009QQcategoryZ16039QQrdZ1QQssPageNameZWD1VQQtrksidZp1638.m118.l1247 QQcmdZViewItem

Cheaper than a Webasto and you could still use it on camping trips.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13