Hey,
I made a letterboxd.com search workflow. It's basically the same as the search IMDB or search movie workflow but here you can search letterboxd.
As soon as letterboxd releases their API i will make some updates to the workflow. As of now you just can search everything.
Just type "lb {query}" to search for movies, directors, actors or users on letterboxd.
Download: Alfred Letterboxd Workflow