Dunno if this was posted before, but I just downloaded the Kick Ass score for the original movie and noticed that it has an edited version of "Stand Up" that's different from the album mix with a cool string breakdown. If you saw the movie, you know what I'm talking about. There's also a track called "Stabbing - Morphine" that is labeled Marius de Vries & The Prodigy, which has bits of "Omen" but pitched differently featured during one of the earlier fight scenes.
01. Henry Jackman & Marius de Vries - Armenian Superhero
02. The Prodigy - Stand Up 3:32
03. Marius de Vries - Forcefield
04. Henry Jackman - Watching
05. Henry Jackman - Man In The Mirror
06. Marius de Vries - A Punch In The Chest
07. Marius de Vries & Ilan Eshkeri - Roof Jump
08. Henry Jackman - Time To Engage
09. Marius de Vries & The Prodigy - Stabbing - Morphine 1:56
10. Henry Jackman - I'm Kick-Ass
11. Marius de Vries, Ilan Eshkeri, Henry Jackman & John Murphy - Famous
12. Marius de Vries - A Friend Like You
13. Danny Elfman - Walk To Rasul's
14. Marius de Vries & Ilan Eshkeri - Trick Or Treat?
15. John Murphy - Leaving Rasul's
16. John Murphy - Hit Girl & Big Daddy
17. Henry Jackman & John Murphy - Damon & Marcus Comic Book
18. Ilan Eshkeri & John Murphy - I Miss You Both
19. Henry Jackman - Hunting Kick-Ass
20. Henry Jackman - Mistmobile
21. John Murphy - Big Daddy Kills
22. Marius de Vries - One Last Time
23. Marius de Vries - Sleepover
24. Marius de Vries - To Brooklyn Bridge
25. John Murphy - Safehouse / Ambush
26. John Murphy - Showtime Pt 2. (It's Only The End Of The World)
27. John Murphy - Nightvision
28. John Murphy - Strobe (Adagio in D Minor)
29. Henry Jackman & John Murphy - Big Daddy Dies
30. John Murphy - Hit Girl Drives Home
31. John Murphy - Marshmallows
32. Ilan Eshkeri - Choose Your Weapon
32. Marius de Vries - You Got Five Minutes
34. Henry Jackman - No Power, No Responsibility
35. John Murphy - The Corridor
36. Ilan Eshkeri & John Murphy - Kitchen Stand Off
37. Marius de Vries, Ilan Eshkeri, Henry Jackman & John Murphy - The Fight
38. Henry Jackman & John Murphy - Flying Home
39. Henry Jackman - True Identity