Skyrim: Which Side Are You On, Boys?

Early in the game you are asked to pick sides in the civil war.  Will you choose the Stormcloaks or the Imperial Army?  I can't find information about whether the choice you make closes off quest lines, but I did find this explanation of the war and what happens when you choose.
http://www.justpushstart.com/2011/11/12/skyrim-imperial-army-or-the-stormcloak-the-breakdown-and-the-consequences/

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