In early May Google announced Universal Search. They intend to begin combing all or most of the search features currently handled in separate search functions, such as videos, news, etc into one “universal search”.
The reason is simple, most people only use Google’s main search feature never utilizing the other search features.
There’s an interesting post on Search Day. Phil Stelter describes what he thinks Universal search will mean for Google and for search marketers. He also touches on the evolving Personalized Search. Read the post at http://searchenginewatch.com/showPage.html?page=3626082