How Do Polarized Sunglasses Work?

Quick Questions takes you on a trip with a photon to explain what polarized light is, and how some sunglasses can filter it out to spare you the glare.
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Sources:
http://physics.info/polarization/
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/polclas.html
http://www.exploratorium.edu/snacks/polarized_sunglasses/
http://www.wisegeek.com/what-are-polarized-lenses.htm
http://books.google.com.au/books?id=lNsDAAAAMBAJ&pg=PA481&dq=Popular+Science+1936+plane+%22Popular+Mechanics%22&hl=en&ei=YQxKTqCgIeSDsgK6xpzSCA&sa=X&oi=book_result&ct=result&sqi=2&redir_esc=y#v=onepage&q=Popular%20Science%201936%20plane%20%22Popular%20Mechanics%22&f=true
http://www.google.com/patents/US1918848
https://www.youtube.com/watch?v=E9qpbt0v5Hw