I'd confront them. They're getting off easy if you say nothing.

i would have to fight the urge to approach her. If you really wanted to make an impact you would talk about the amazing time you had. Then say something like, "huh, too bad you didn't show up..." Then you switch topics on her. It's important to remain cool in situations. She will most likely feel a bit left out, and not distanced from your confrontation if you don't make a big deal. This will make her more inclined to keep her next date if you decide she's worth it. Once again, although angry, i wouldn't bring it up much. I'd just say, "well too bad for her" and drop her like a plate at a greek wedding. (Unless, of course, SHE approached ME, all apologetic, and had a good reason for standing me up)