1:M Single Line Return

Just messing about with a silly little problem in SQL which has me stumped!
The problem goes like this;
There are lots of books.
There are lots of authors.
Every book has atleast one author (primary author).
Some books have a secondary author too!

Books(BookId, BookName)
Authors(AuthorId, AuthorName)
BookAuth(BookId, AuthorId, PrimaryAuth)
Where primary auth is a bit field; 1 denotes primary, 0 denotes secondary.

The problem is trying to return a single line per book - something like

BookNamePrimary AuthorSecondary Author
Book 1DaveNULL
Book 2JohnDave
Book 3LauraJohn

The following code is the little test script I've written which you may wish to utilise

IF EXISTS (SELECT 1 FROM sysobjects WHERE type = 'U' AND name = 'Books') BEGIN
DROP TABLE Books
END
IF EXISTS (SELECT 1 FROM sysobjects WHERE type = 'U' AND name = 'Authors') BEGIN
DROP TABLE Authors
END
IF EXISTS (SELECT 1 FROM sysobjects WHERE type = 'U' AND name = 'BookAuth') BEGIN
DROP TABLE BookAuth
END

CREATE TABLE Books (bookid int, bookname varchar(50))
CREATE TABLE Authors (authorid int, authorname varchar(50) )
CREATE TABLE BookAuth (authorid int, bookid int, primaryauth bit)
GO

INSERT INTO Books
SELECT 1, 'MS Access Book'UNION ALL
SELECT 2, 'Microsoft Excel for Peanuts' UNION ALL
SELECT 3, 'Some Autobiography'UNION ALL
SELECT 4, 'SQL for Beginners'UNION ALL
SELECT 5, 'Advanced T-SQL'UNION ALL
SELECT 6, 'I can''t think of another title'

INSERT INTO Authors
SELECT 1, 'Dave'UNION ALL
SELECT 2, 'Steve'UNION ALL
SELECT 3, 'John'UNION ALL
SELECT 4, 'Joanne'UNION ALL
SELECT 5, 'Christina'UNION ALL
SELECT 6, 'Alex'

INSERT INTO BookAuth
SELECT 1,1,1 UNION ALL
SELECT 2,1,0 UNION ALL
SELECT 1,2,1 UNION ALL
SELECT 1,3,1 UNION ALL
SELECT 3,3,0 UNION ALL
SELECT 4,4,1 UNION ALL
SELECT 4,5,1 UNION ALL
SELECT 5,6,1 UNION ALL
SELECT 6,6,0

SELECT * FROM bookauth

DROP TABLE Books
DROP TABLE Authors
DROP TABLE BookAuth

It should be so easy - but I can't get it so far! :D