I just watched the beginning of tonight's episode of CSI:NY, and there was a pretty big fountain pen role. They found a murdered college student and than later find a pen on the ground (as soon as I saw it, I thought that it might be a fountain pen because it was big and expensive looking). In the next scene, they're in the forensic room and lo and behold, it's a Montblanc fountain pen with a nice bold nib (the nib close-up took up the entire screen (you could make out every detail on my HDTV)). The guy even says "we found this fountain pen," or something of that nature.
In the show, the student had inked it with his own blood, which may or may not be possible (I'm no blood or ink expert). This is the first time that I've ever watched a part of CSI, but I turned it off after the fountain pen role, because frankly, I was pretty grossed out. I think the show's too graphic. Still, it's the biggest fountain pen exposure that I've ever seen on TV, and on a prime time show no less.
Edit: The episode is called Some Buried Bones.