Fast Search

Using FQL to query FAST Search Index
http://blogs.perficient.com/microsoft/2011/06/using-fql-to-query-fast-search-index/
Write a sample project, use FQL syntax to query FAST Search server through search services.
Can also use FQL on KeywordQuery Class build a console application to test FQL syntax.

FastSearch and PowerShell, use powershell to create content source, start crawl, execute search.
https://www.nothingbutsharepoint.com/sites/itpro/Pages/Fast-Search-Server-2010-for-SharePoint-Proof-of-Concept-Part-2b-PowerShell-Configuring-the-connector-Indexing-Content.aspx

Change Managed Property boost using PowerShell
$RankProfile = Get-FASTSearchMetadataRankProfile -Name <RankProfile>
$Property = Get-FASTSearchMetadataManagedProperty -Name <ManagedProperty>
$RankProfile.CreateManagedPropertyBoostComponent($Property, "<ManagedPropertyValue>,<ManagedPropertyBoostWeight>")
$RankProfile.Update()
http://technet.microsoft.com/en-us/library/ff191224.aspx


Change the overall- and managed property context weight by using Windows PowerShell (FAST Search Server 2010 for SharePoint)
http://technet.microsoft.com/en-us/library/ff191252.aspx

Fast Search Articles
http://gallery.technet.microsoft.com/office/site/search?f%5B0%5D.Type=User&f%5B0%5D.Value=Jan%20Inge%20Bergseth
Create a custom full text index using powershell
http://gallery.technet.microsoft.com/office/Create-a-custom-full-text-14811b11
Create and tune a custom rank profile for fastsearch
http://gallery.technet.microsoft.com/office/Create-and-tune-a-custom-c2f79c49
Manage Crawled Properties
http://technet.microsoft.com/en-us/library/ff191246.aspx
exclude a crawled property from indexing
$CrawledProperty = Get-FASTSearchMetadataCrawledProperty -Name "<CrawledPropertyName>"
Set-FASTSearchMetadataCrawledProperty -CrawledProperty $CrawledProperty -IsMappedToContents $false
indentify unmapped crawled properites
$category = Get-FASTSearchMetadataCategory -Name "<CategoryName>"
$unmappedCPs = $category.GetUnmappedCrawledProperties()

Good aritcle on index schema and its features
The index schema and its features (FAST Search Server 2010 for SharePoint)
http://technet.microsoft.com/en-us/library/gg982954.aspx