Google result filter-filter irrelevant sites

The google result filter will see which queries have results on the google search engine and which do not. Using the google filter website you can remove sites from the search results.

So if you feel a site is nothing but spam, just add that to your list of sites to be excluded. You can take a look at the translated version here.
Translated version of http://www.google-filter.com/

They make use of the google API to provide a personalized site filter. With the google coop search, this can be done effectively. It is a pity that the personalised search does not have the same feature. You can bookmark something to be excluded.