The documentation for the current LucidWorks Platform release (v2.1 as of April 17, 2012) is always located at http://lucidworks.lucidimagination.com/display/help.
Help pages for v2.0 have been archived here:
Page:
ACL Filtering
Page: Add a JDBC Driver
Page: Alerts
Page: Collection Overview
Page: Collections Summary
Page: Data Sources Configuration
Page: Field Type Configuration
Page: Indexing Settings
Page: Login Screen
Page: LucidWorks Logging
Page: Query Settings
Page: Schedules
Page: Search Filters for Access Control
Page: Searching
Page: Stop Words
Page: Synonyms
Page: System Settings
Page: User Management
Page: Add a JDBC Driver
Page: Alerts
Page: Collection Overview
Page: Collections Summary
Page: Data Sources Configuration
Page: Field Type Configuration
Page: Indexing Settings
Page: Login Screen
Page: LucidWorks Logging
Page: Query Settings
Page: Schedules
Page: Search Filters for Access Control
Page: Searching
Page: Stop Words
Page: Synonyms
Page: System Settings
Page: User Management