This extension can be used to search for selected text using the context menu. Different search engines can be added according to the user’s wish to the right-click menu. The search results are shown in a new background tab. The order of the search engines in the right-click menu can also be arranged. A list of 35 commonly used search engines has been added so that users can choose easily. If needed, the user can also add an option which has not been included.

Download (via Extension Gallery)

Screenshot:

You need at least Chrome version 6.0.472 to install and use this extension. If needed, you can install from any channel you want here: http://www.chromium.org/getting-involved/dev-channel#TOC-Windows

The options page: