Hey, while you're checking out that "Netflix" thingy, you might want to look into this new device called the "cellular phone". I hear people are using it to "text" each other. Also, there's something about "email".
I'm sorry, Zensteve and LIFE. I can't believe you tried to explain NETFLIX to her! She's on the internet, for crying out loud. And she's nerdy enough to be hanging out in a forum!
Anyway, cliche (can I call you that?), I'm going to offer you some random "must-see's" that are a little off the beaten path, cuz you already are aware of the other ones.
"Born Into Brothels" - Based on what it's about, you might expect it to be dark and depressing as shit. Just the opposite, it's an absolute joy to see these (some of them, anyway) kids rise above their surroundings.
"Waiting for Guffman" - This one's only slightly off the beaten path; tons of people are fans of it. No disrespect of course, but judging by your relative age, I wonder if you've seen it yet.
"Waltz with Bashir" - Half documentary/half artistic re-enactment, this movie keeps your interest, but intentionally keeps your emotion at bay, until an unexpected ending that's like a hard punch in the stomach.
"Avatar" - Oh, wait. Sorry, wrong thread.
"Dark City" - It's not a must-see must-see. But it's probably the best sci-fi that nobody's ever heard of. It's half murder-mystery, half-kinda-matrixy, 100% awesome.