One thing to do is go to your queue and click on one of the movies to go to its page. There you will see a catagory called "Enjoyed by people who enjoyed..." with a list of seven or eight films. Sometimes you will see something you might like there. Also, when you add a movie to your queue, you will see a page of related films. And lastly, vote on films you've seen and you will have a "Recommendations" page. Now, none of these are incredibly effective. All of the recommendations I get are films I've already seen. But together these things work nicely. There's also a new sort of "friends" network where people recommend things to each other, apparently, but I haven't tried it yet.
One thing to do also is arrange your queue so that you are getting similar types of films juxtaposed with one another. This can inspire some new additions sometimes. Here's an example from my queue:
King of New York: SE (Widescreen)
Deep Cover
New Jack City
Bad Lieutenant
A Bullet in the Head
A Better Tomorrow
A Better Tomorrow II
And further down my list I have:
The Night of the Hunter
On the Waterfront
From Here to Eternity
Rififi
Wages of Fear
Also, if you like anime, Netflix has tons of it. I'm a Netflix whore right now, sorry for the shilling.