what are some of your favourite collaborations

mine have to be

mos def, kweli, and common on respiration
nas, luda and jadakiss on made you look remix
kool g. rap and big l on fall back

2pac & Scarface - Smile
Scarface & Nas - In Between Us
Kanye West, Mos Def, Freeway - 2 Words
Nas, Ludacris, Jada - Made You Look Remix

all i can think of off da top of my head...

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red and meth - how high
nas, meth, ja and dmx - grand finale
eminem and method man - dj clue proffesional 2 (cant remember the track title)
Dmx and 50 cent - shot down