Hide Google Options (recommended)
The Hide Google Options browser plugin allows you to take control of your Google search results page by keeping the Google "Options" panel as an elective feature.
The Hide Google Options plug-in lets you remove the Google sidebar from view or let it show, as you choose.
Link: http://www.seotools.com/hide-google-options/index.htm
Disable Google Everything Sidebar
Remove the "Everything" left bar from the new Google layout.
It also expands the results text to better use the page width.
1. get the stylish plugin from:
https://chrome.google.com/extensions/detail/fjnbnpbmkenffdnngjfgmeleoegfcffe
https://chrome.google.com/extensions/detail/fjnbnpbmkenffdnngjfgmeleoegfcffe
2. install the user script from:
http://userstyles.org/styles/29554
http://userstyles.org/styles/29554
Alternative stylish scripts:
http://userstyles.org/styles/29516
http://userstyles.org/styles/29418
http://userstyles.org/styles/29379
Hides Google Sidebar
Creates a button below Google search bar to make possible show and hide this annoying left sidebar in Google search results. It remembers last user's choice.
While in chrome just click: Install
Source: http://userscripts.org/scripts/show/76243