Using DATABASEPROPERTY function and IsFullTextEnabled parameter.
CODE:

USE AdventureWorks;
GO
SELECT DATABASEPROPERTY('AdventureWorks', 'IsFullTextEnabled');
GO

REFERENCE: "Obtaining Full-Text Property Values using Transact-SQL Functions" http://msdn2.microsoft.com/ms142579.aspx

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Cristian Andrei Lefter, SQL Server MVP
MCT, MCSA, MCDBA, MCAD, MCSD .NET,
MCTS, MCITP - Database Administrator SQL Server 2005
http://sqlserver.ro