Helpful links and blogs

http://www.energyvanguard.com/
This one can be fairly technical, but it's a wealth of knowledge!

http://www.southface.org/default-interior/Documents/ga-field-guide-res.pdf

This is a link to the new residential codes

http://www.youtube.com/watch?v=QZTly-CTQ4o&feature=related

Video from Southface about duct leakage testing.

http://www.youtube.com/watch?v=lHjI2Tfl5Xg&lr=1

Video from Southface about blower door testing.