I have not checked out Nick and Norah's Infinite Playlist.  But they just don't seem to make teenage movies like they use to.  My favorites are as follows:

1. Pump Up The Volume

2. The Breakfast Club

3. Heathers

4. Ferries Bullers Day Off

5. Back To The Future

6. Before Sunrise (Not sure if this one would be a teenage movie though)

7. Say Anything

Real Genius.  The nerdy girl changed my taste in the ladies from then onward.

Does Gotcha count?  He was college-age...

The only teenagers I care for are mutant, ninja, turtles!!!!

Well, I would say Scream (the first one). I see this movie more as a teen movie than a horror movie...

And also Ghost World... but well... gotta say that 10 Things I Hate About You was my all time favourite movie when it came out. I saw it like every single day during my one week winter break that year... hmm... But I was 13, so I guess that's the reason...

Some of my fave teen movies are in the baaaack of the video store. But I can't really name them here (wink wink)...

Weird Science

Sixteen Candles and Pretty in Pink. What can I say? I'm a Molly Ringwald girl.

Class

Dazed & Confused. I was a senior in '75!!!

I haven't thought of Class in a long time.  Yeah, I think James Spader was one of the best teen bad guys.  He really gets under your skin Weird Science and Dazed And Confused are great as well.  Even though my favorite Richard Linklater are the Before Sunrise/Before Sunset Films.  How could I forget A Walk To Remember.