Maybe you should read the Washington Post article on this by Monte Reel, published sometime in July, I think, last year. Although the Surui are an exception since they recieved electricity (and laptops) last year, most of these tribes in the Amazon don't have running water, electricty or computers as yet.
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Google LatLong Blog:
http://google-latlong.blogspot.com/2007/06/trad...
and this article:
"Deforestation of Brazil's Amazon Rises Sharply" The Associated Press, January 24, 2008
http://www.msnbc.msn.com/id/22818963/