Google: Vertical search - secret weapon?

Targeting profiles
I think one of the reason Google is providing a better search experience than other rivals is its ability to deliver very relevant results to specific profiles of searchers.
E.g. 1: businesses or individuals looking for local suppliers



If you search for "printers london" for instance, Google will combine results with google map, and display directly a list of local printers in the results page.

E.g. 2: definitions

If you are looking for a definition of a word or expression, Google will return a series of definitions in search results.

Always adding new "vertical" results.
And Google keeps adding new "vertical add-ons":

E.g. 1: people looking for information on a specific site (large portals)




If you are looking for a book on amazon, you can use their search box directly for Google search results.

E.g.2: Programmers looking for code snippets
This one was added only very recently. Just type in some random code, and you'll find files containing this code



Some articles pointed out that Google was upsetting large websites such as amazon with their embedded search bar:
"[Google] has absolutely crossed the line because it's so blatantly about commercialisation and not user experience."
Richard Gregory, COO of Latitude

I personally don't think that these features are driven from the marketing department. By improving its vertical results, Google improves the user's experience, and keep them on its results page.

This is of course a matter of concern to all publishers (Amazon complained about the search box, and got it removed for instance), who get their number of page views reduced, and consequently their advertising revenue. But Google's mission statement is to offer the best results to its users, allowing them to find the right product/service/content directly from the search results, and the addition of these "vertical features" are going in the right direction, keeping Google ahead of the game, and definitely improving the overall user experience.