'Insomnia' may be the least impressive of director Christopher Nolan's films (admittedly, I haven't seen his debut film, 'Following'), but the fact that it is directed by Nolan means that it is still a minor masterpiece. With the exception of 'The Dark Knight', it is the most straightforward Nolan film, with the most linear storytelling. It's a much more standard thriller than 'Memento', but it is beautifully shot and tautly told by Nolan. To date, this may be the last truly great performance that Al Pacino has given. And Robin Williams is also almost unexpectedly excellent; with the one-two punch of 'Insomnia' and 'One Hour Photo', he certainly cornered the market on "creepy". I can't wait to see Williams walk on the dark side again.