Haven't seen it but the storyline looks good, though the graphics suck; Strange Frame: Love and Sax Yes that is the title of it, available through amazon or the website, even on YouTube.
Fried Green Tomatoes The Incredibly True Adventure of Two Girls in Love Bobbie's Girl These films are all definitely worth watching! They aren't specifically revolving around the fact that it is a butch/femme relationship, but the main characters do fit into that catagory