The Life of Luck Cucumber and Jack's Law - Tech N9ne
Belly - DMX, Nas, Method Man
Crash - Ludacris
2 Fast 2 Furious - Ludacris
Hustle and Flow - Haystak, Ludacris, DJ Paul, Josey Scott (most hip-hop rocker I know), Juicy J, I-20, Al Kapone
Black Snake Moan - David Banner
Fred Claus - Ludacris
The Wash - Dr. Dre, Snoop Dogg, Ludacris, DJ Pooh, Tray Dee, Kurupt, Xzibit
Half Past Dead - Kurupt, Ja Rule,
Dark Blue - Kurupt
Johnson Family Vacation - Kurupt
Gridiron Gang - Xzibit
8 Mile - D12, Xzibit, DJ Head, Eminem, Obie Trice
Derailed -Xzibit
Who's the Man? - Dr. Dre and Ed Lover and Busta Rhymes
Smokin' Aces - Common
How High? Redman and Method Man
Garden State - Method Man
Shaft - Busta Rhymes and Snoop Dogg
Bones - Snoop Dogg
Starsky and Hutch - Snoop Dogg
LL Cool J is no longer a rapper.
Nor is Eve(kinda) or Latifah. You can find any of them in your local metroplex.
Treach is a movie guy now. You can find him in softcore, over-acted porn now.
Ice Cube has his hands in a bit of everything as of late.
The Fighting Temptations - Lil' Zane, T-Bone
Life - Heavy D
Gridlock'd - Tupac
Poetic Justice - Tupac
Above the Rim - Tupac
Bullet - Tupac
Gand Related - Tupac
Sister Act 2: Back in the Act - Lauren Hill
The Hitchhiker's Guide to the Galaxy _ Mos Def
16 Blocks - Mos Def
Something the Lord Made - Mos Def
The Italian Job - Mos Def
Monster's Ball - Mos Def
There may be more rappers in some of these movies, but they're the ones that stood out in my mind.