Fast Search Features In Sharepoint2010

1)Search Box, with capability of suggestions while typing.
2)Now you can see thumbnails and previews of your word or powerpoint files in the search result page.
Power point files can be previewed without opening file or even with a PowerPoint client or with office web application.
3) By using office application office files can be opened in the browser.
4)FAST search provides visual best bets which are pictures or videos that are best bets for several key words.
5)Deep Refiners with counts based on Meta data.
Refiners are placed in left side i.e. refiner results web part which displays
the count and refiner like author is a refiner suman (12), xyz(20) means the
results are filtered and refined like this way to easy find the search results.
6)SharePoint search provides powerful social capabilities search like based on user information like department, skills, city etc.
7) Each property can be the base of sorting, configured in the “Sort by” field.
8)You can see similar search result in FAST search.
9) FAST Search supports language-specific search.
10)FAST Search Server 2010 can be scale-out upto 500 million items.
11) Easy-to-configure sorting and refinement.
12)Social search provides a  people search center which provides specific capabilities for connecting with people
13)document promotions, document demotions, site promotions, and site demotions with defined user contexts.

Shallow results refinement
Refine results using metadata associated with the top results.

Deep results refinement
Refine results using metadata associated with all results.

refines based on user context,based on synonym

 Results set, with document thumbnails, PowerPoint previews, View in Browser links for all documents, and Similar Results link for all result.