Ohio State University
Ohio State University: Electronegativity & Bond Polarity
Excellent graphics help this page explain the relationship between electronegativity and bond polarity.
Clackamas Community College
Clackamas Community College: Electronegativity
A good discussion of electronegativity and its effects on bond polarity and bond type.
Frostburg State University
General Chemistry: Why Oh, Nh, and Fh Bonds Are Polar
Frostburg State University provides a brief explanation to the question of why small hydrogen molecules, such as OH, NH, and FH, are very polar.