Design Rules by Elaine Griffin. gives great Rule of Thumb measurements for everything .
Stacking Chart for Roman Shades - Stacking Height Measurements
Hanging Style Diagnostic and many more home decor guides.
Staircase Gallery Layouts Via Vered Rosen Design.
How to Get Window Treatments Right - Claire Brody Designs
Drapery How to Get it Right
My best piece of advice for window treatments.