I recently found out that Director Tom Tykwer recently did a film involving polyamory. It came out in 2010 and is titled "Three"

"A Berlin-set drama centered on a 40-something couple who, separately, fall in love with the same man. "

Here is the movie's IMDB page
link

Here is a german trailer for the film
link

Does anyone know where I could get an english subtitled copy of this film, or has it not come to dvd etc.. yet?