For people that don't know what a vertical search engine is: http://en.wikipedia.org/wiki/Vertical_search http://en.wikipedia.org/wiki/Vertical_search Usually

For people that don't know what a vertical search engine is: http://en.wikipedia.org/wiki/Vertical_search http://en.wikipedia.org/wiki/Vertical_search Usually Google using the "site:" command for stackoverflow etc, since I'm satisfied with the way Google orders the results.