This will be a thread on my favorite anime OP/ED. Nothing will be in order, and I will probably update this thread sporadically. This will be more a collection of my favorites than a top list.

The quality of these doesn't necessarily reflect the quality of the show. Just saying!

Hokuto no Ken OP1

Ai wo Torimodose by Crystal King

Hokuto no Ken 2 OP

Tough Boy by TOM★CAT

Hokuto no Ken (Movie) ED

Purple Eyes by Kodomo Band

BECK OP

Hit in the USA by Beat Crusaders

Yu Yu Hakusho OP

Hohoemi no Bakudan by Matsuko Mawatari

Monster OP

Grain by Kuniaki Haishima

Monster ED1

For The Love of Life by David Sylvian

Gyakkyou Burai Kaiji S2 OP

Chase the Light by Fear, and Loathing in Las Vegas

Death Parade OP

Flyers by BRADIO

Legend of the Galactic Heroes OP3

Sea of the Stars by LISA

Legend of the Galactic Heroes ED1

Hikari no Hashi wo koete by Kei Ogura

Jojo's Bizarre Adventure OP (All of them)

Artist (can't fit the name of all songs):
TOMMY Tominaga
Coda
Jin Hashimoto
JO☆STARS
THE DU
batta
Karen Aoki, Daisuke Hasegawa
Daisuke Hasegawa & Yugo Kanno

Kokkoku OP

Flashback by MIYAVI vs. KenKen

Parasyte OP

Let Me hear by Fear, and Loathing in Las Vegas

Hunter x Hunter ED1

Just Awake by Fear, and Loathing in Las Vegas

Hunter x Hunter ED2

Hunting For Your Dreams by Galneryus

Ashita no Joe 2 OP2

MIDNIGHT BLUES by Ichiro Araki

Couldn't find the OP on Youtube, so you'll have to live with just the song.

Psycho-Pass OP2

Out of Control by Nothing's Carved in Stone

Slayers TRY OP

Breeze by Megumi Hayashibara

Hajime no Ippo ED1

Yuuzora no Kamihikouki by Naoya Mori