Covalent bonds result from two nonmetal atoms sharing electrons. Both atoms share these electrons to fill their octet. When atoms of different elements share electrons through covalent bonding, the electron will be attracted more toward the atom with the higher electronegativity. This unequal sharing of atoms creates an electric dipole which makes the bond polar.
Helpful Links:
http://chemwiki.ucdavis.edu/Core/Theoretical_Chemistry/Chemical_Bonding/General_Principles_of_Chemical_Bonding/Covalent_Bonds
http://chemistry.tutorvista.com/physical-chemistry/covalent-bonding.html
Peter I used the same picture on my blog for the bonding! It's a really great visual.
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