There are so many...
Currently finished 2004 anime :
Kite He ~Diamond Dust Drops~
Paranoia Agent
Ghost in the Shell SAC 2nd GIG
Divergence Eve 2 Misake Chronicles
Yugo
Cosprayer/Smash Hit/LOVE LOVE!!!
Currently ongoing 2004 anime :
MONSTER
MADLAX
Melody of Oblivion
Baku Ten
Samurai Champloo
Tweeny Witches (Mahou Shoujo Tai Arisu)
KURAU Phantom Memory
Otogizoushi
Soukyuu no Fafner
Elfen Lied
2004 OVAs :
Interlude
Le Portrait de Petit Cossette
Currently not-yet-started 2004 anime :
Gankutsuou
Gundam SEED Destiny
Mai Hime
Beyond Cloud The Promised Place -The place promised in our early days-