There are some great updates this time around.
Xringer has put together a great thread on a
DIY install of a Sanyo heat pump / AC unit.
I've gotten batteries for the riding mower and have begun
making battery racks for it.
Charlie D has a house up in Canada with big utility bills that he is trying to
winterize on the cheap.
AC Hacker has put together a great thread containing info on
DIY hydronic floor heating.
GvilleRenovator has done some recent work in his attic
sealing air ducts leaks.