Wow. Every single one that came to mind was on there..
Had to laugh at a few of them though... I remember those scenes in 10 Things I Hate About You, Little Miss Sunshine, Pretty In Pink, etc. Oh and Office Space for the smashing the printer scene LOL. & I noticed Donnie Darko - I'd been trying to figure out where I heard the song Under the Milkyway for ages, haha.
Some I like that weren't on the list:
Slumdog Millionaire - Paper Planes (MIA)
127 Hours - Lovely Day (Bill Withers)
Seeking a Friend for the End of the World - The Air that I Breathe (The Hollies)
13 Going on 30 - Thriller (Michael Jackson)