For example, if one searches for "good offices " on Wikipedia, one discovers that there is no such article, yet immediately sees a link to Wiktionary (a dictionary) that gives the definition for this term:
The beneficial services and acts of a third party; especially when used to mediate between people in a disputeWith over 2.5 million articles it is quite difficult to find something missing from Wikipedia, but if you do find such a thing now there's a chance you won't be left unsatisfied.
An other example is if you search for something that already has an article, e.g. "Bill Clinton" and you immediately receive links to some of his speeches, best quotes, and most recent news appearances.
I can hardly wait for the Hungarian Wikipedia to be migrated to this new system as this might be the very best thing that will have happened to the sister projects in a long time: they will receive greater exposure, possibly encouraging more people to contribute and the readers will have easier access to more information.