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Looks like I may have found a "consolation prize" type method of using unripe tomatoes if the plants are going to die...
http://www.epicurious.com/recipes/food/views/Green-Tomato-Soup-230446
I wish I'd known about it before tossing all the unripe leftovers at the end of last season.
Google page with more recipes:
http://www.google.com/search?hl=en&q=green+tomato+soup&aq=f&oq=&aqi=g1