I am not sure this is known

Awhile ago I heard on a Drupal podcast the following tip:

site:drupal.org

which will allow you to search in Google only the drupal website.

But say you want to find only a module for version 5.x then you type:

5.x site:drupal.org/project/Modules/

So for example:

Biblio Facets 5.x site:drupal.org/project/Modules/

Will get you there a lot quicker. ;-)

Bookmarking the subdirectories with the versions will give you a quick search guide to Drupal.

Hope it helps.