Resources for Energy Conservation
Insulation and weatherization
Department of Energy provides a checklist to help you decide if your home needs more insulation.
The Rocky Mountain Institute has tips on sealing air leaks (tips link opens a PDF file).
Tips on buttoning up your home from the American Council for an Energy-Efficient Economy's Consumer Guide to Home Energy Savings: Condensed Online Version
More insulation tips and from the Department of Energy, plus a map of the recommended R-values for existing homes in different sections of the U.S.
Misc.
Fleece throws are easy to make. HGTV has directions.
If sewing's not your thing, Jo-Ann Fabrics and Crafts has instructions for a no-sew fleece throw.
Stay warm while being a couch potato with a patchwork wool throw made from old skirts, jackets or pants. The pattern is from Sew News.
Window Coverings
Denver Fabrics has free directions for making variety of window treatments
Instructions for making a thermal shade from the Mother Earth News archives.
Lined curtains are another good option. A British site tells how to make them.
Sue Robishaw gives directions for making a window quilt.