Lupe Fiasco:
The Die
Conflict Diamonds
Put You on Game

Mos Def:
I against I

Pharoahe Monch:
Simon Says
Agent Orange

The Roots:
In The Music
Take it There
Here I Come
The Seed/Melting Pot/Web (Live)

Kanye feat. Freeway, Mos Def:
Two Words

Jay-Z:
No Hook

Eminem has a ton of 'em... how can you say no one's heard Stan?