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Just putting it out there.
Heat? Like average temperature? Heat magazine readership? Heat given off as a result of bad housing insulation? Police giving the smackdown to criminals?
in a given area (possibly with more heat for for more prize money totals as well as density of winners...)
And I don't know, sorry.
You could start here: http://code.google.com/search/#q=heat%20maps
or equally confusing stuff...
I could look it over and see if it's actually pretty quick coding for me to do for you.