1-) First go to http://www.google.com

2-) Press on the right, next to the textfield, on "Advanced Search".

http://i47.tinypic.com/2nbf67c.png

3-) Fill in your dork at "This exact wording or phrase".
Results per page: 100 results (Or less depending on your internet speed.)
Language: Could be all languages or one language. I choose Dutch because I'm Dutch myself and I got a Dutch ISP so those sites will load faster.
Where your keywords show up: "in the URL of the page"

4-) Press search.

5-) Now we get this:

http://i47.tinypic.com/2z5uqvl.png

6-) Press on about 10 links with your middle mouse (scrollbar) so each page will be opened in a new tab.

7-) Open the tabs and add as example a single quote behind the link.

8-) If it's vulnerable continue your injection else repeat step 5 -> 6.

Very easy (:
With this method I can find about 30 vulnerable websites in less than 2 hours and a few websites to upload a shell to.