One of my colleagues sent me a webpart that they had found that when added to a SharePoint site the left navigation or Quicklaunch no longer displayed. What this web part was basically doing is injecting the css styles that removed that section from displaying. You also can accomplish the same thing by modifying the style sheet that is applied to your site, remember it may be different if you have applied a theme or different master page. Jsut fine the .leftNav style and add display:none;. Waalaa no more left Navigation.
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