remove-all-database-except.sql

DECLARE @name VARCHAR(100) -- database name 
DECLARE @SQLString nvarchar(200)
DECLARE db_cursor CURSOR FOR 
SELECT name 
FROM MASTER.dbo.sysdatabases 
WHERE name NOT IN ('master','model','msdb','tempdb','spare-me','me-too') 

OPEN db_cursor
FETCH NEXT FROM db_cursor INTO @name  
use master
WHILE @@FETCH_STATUS = 0  
BEGIN  
    SET @SQLString = 'ALTER DATABASE [' + @name +'] SET single_user with ROLLBACK IMMEDIATE;
    DROP DATABASE [' + @name +']';
    EXECUTE (@SQLString)
 	FETCH NEXT FROM db_cursor INTO @name 
END 
CLOSE db_cursor  
DEALLOCATE db_cursor