Hi, all,
From the Peak Oil meetings I attended, this group is interested in practical alternatives to expensive energy.

"Rocket Stoves," or more properly "Rocket Mass Heaters," are a super-efficient, super-clean way to heat a space using a very small amount of wood fuel and producing very little smoke. You can literally grow your own fuel on a 1/4 acre urban lot. The stove is a hybrid masonry and j-tube stove, which can be built into an attractive bench or bed, or installed along a wall or room divider for inconspicuous warmth.

The workshop, listed here: http://trackersnw.com/html/pdx/themes/portland_natural_building.php