Wow, okay I'm not going to be an elitist bastard and say that because 100 million people don't buy this stuff it's obviously the coolest music ever...people like that are a waste! Here are my pics:
1) Marilyn Manson - The Golden Age of Grotesque
2) Lil' Jon & the East Side Boyz - Kings of Crunk
3) Ludacris - Red Light District
4) Nas - Street's Disciple
5) Dieselboy - The Dungeonmaster's Guide
6) The Beastie Boys - To the 5 Boroughs
7) Rammstein - Reise Reise
8) Nonpoint - Recoil
9) Kanye West - College Dropout
10) Twista - Kamikaze
I really can't think of any other great CRAB for 2004, it wasn't particularly spectacular for rock music by any means...anyways, maybe some of my suggestions will introduce someone to something new as most of your suggestions did.
Biggest Disappointment: Eminem - Encore