Talk about search options and bells and whistles......

example search:
viewzi.com/search/4sources/seo

review:
techcrunch.com/2008/06/09/excl ...

kosmix.com/topic/seo?

Another interesting attempt at creating a vertical, universal search....
worth a try for comparisons of information sources

Here is a review and comments from Techcrunch
techcrunch.com/2008/06/25/kosm ...