Your Top 5 Anime IN/OP/ED Songs.

[LordKefka]

Anyways, I'll go first with mine up to date.

1. Float~ - ED of Solty Rei
2. Kimi to Yozora to Sakamichi to - ED1 of Myself; Yourself
3. Kuusou Rumba - OP1 of Zoku Sayonara Zetsubou Sensei      
4. Niji no Kanata - IN song of Gun x Sword
5. Born - OP1 of Le Chavalier D'Eon

Some runners up are like Joint- OP 1 of Shana 2, Friends- ED1 from Gundam 00, 100 Miles- ED of Oh! Edo Rocket and etc...

[Tsubasa]

Should be something like this:

1. Give a Reason - Slayers NEXT OP
2. Platinum - Card Captor Sakura OP3
3. Sore ga Ai Deshou - Full Metal Panic? Fumoffu OP
4. ETERNAL BLAZE - Mahou Shoujo Lyrical Nanoha A's OP
5. Tomoshibi - ToHeart2 ED

[mDuo13]

Mm, this is always interesting to think about. And difficult.

1. A Thousand and One Nights (.hack//SIGN IN & .hack//LIMINALITY OP2)
2. Canta Per Me (Noir IN)
3. The Sacred Moon (Shingetsutan Tsukihime OP)
4. Liquidation (Gankutsuou IN)
5. Yasashii Yoake (.hack//SIGN ED)

And, because it's too hard otherwise, a lot of honorable mentions:
Re-Sublimity (Kannazuki no Miko OP), Anata ga Ita Mori (Fate/stay night ED1), Toki wo Kizamu Uta (CLANNAD ~AFTER STORY~ OP), Kiseki no Umi (Record of Lodoss War: Chronicles of the Heroic Knight OP), You Get to Burning (Martian Successor Nadesico OP), Duvet (Serial Experiments Lain OP), Gotta Knock a Little Harder (Cowboy Bebop IN), "Libera Me" from hell (Gurren Lagann IN), Wind (Naruto ED1), The Sore Feet Song (Mushishi OP), Naraku no Hana (Higurashi no Naku Koro ni Kai OP), Undiine (ARIA The ANIMATION OP), Farewell Song (AIR ED)

[Gatsby]

1. Higurashi no Naku Koro ni (HnNKn)
2. Lilium (Elfen Lied)
3. Love Slave (DearS)
4. Shooting Star (Please Teacher)
5. Real Folk Blues (Cowboy Bebop)

[kollunz]

1. Invoke by TMR - Gundam Seed OP
2. Sousei no Aquarion by AKINO - Sousei no Aquarion OP
3. Asterisk by Orange Range - Bleach OP
4. Danzai no Hana by Riyu Kosaka - Claymore ED
5. Thesis of a Cruel Angel by Yoko Takahashi - Neon Genesis Evangelion OP

[xXunyuuXx]

Tah dah! O_O
Well my favorite song change a lot about once a week >.>

Ash Like Snow by Brilliant Green from Gundam Seed 00
Black Diamond by Nana Mizuki from Shugo Chara
Kirameku Namida Wa Hoshi Ni by Tainaka Sachi from Fate Stay Night
World Ends by Flow from Code Geass R2
Rinne Rondo by ON/OFF from Vampire Knight Guilty

I have more but I shall top to the limit @.@

[Aru Sakayama]

1. Duvet by BoA (serial experiments lain)
2. Stray by Steve Conte (WOLF'S RAIN)
3. Pa-Pa-Do-Wa by 徳永愛 (Tokunaga Ai) (魔法遊戯　飛び出す!!ハナマル大冒険)
4. Allegro Cantabile Sound by SUEMITSU & THE SUEMITH (のだめカンタービレ)
5. What'bout My Star by 中島愛 (Nakajima Megumi) (マクロスF)

[Yukari Kaiba]

1.DTechno Life by UVERworld (Bleach OP 2)
2.Ready Steady GO by L'Arc en Ciel (FMA OP)
3.Haruka Kanata by Asian Kung Fu Generation (Naruto OP 2)
4.Houkiboshi by Youhna (Bleach EN 3)
5.Just Communication (Gundam Wing OP)

honorable mentions:Sorario Days (Gurren Lagann OP), Daybreak's Bell (Gundam00 OP1), Chain (Air Gear OP), and Brightdown (D-Grayman OP1)

[mDuo13]

1. Duvet by BoA (serial experiments lain)

Duvet is not by BoA (the JPop singer).
Duvet is by boa (also known as "Bôa"), a UK band.

[LordKefka]

Oh snap! I guess things change! =D

1. Gundam 00 - Unlimited Sky
2. Chrome Shelled - Yasashii Uso
3. Hajime no Ippo New Challenger - Hekireki
4. To Aru Majutsu no Index - Masterpiece
5. To Aru Majutsu no Index - Rimless~ (zomg two songs from the same animu? unpossible!)

[mDuo13]

... how mercurial of you.

[LordKefka]

I know right =P

[_Rena_]

1. Shichitenhakki Shijou Shugi by KOTOKO- Hayate no Gotoku
2. Trust You by Yuna Ito - Gundam 00
3. Paper Moon by Tommy Heavenly6 - Soul Eater
4. Hishoku no Sora by Mami Kawada - Shakugan no Shana
5. What's up People? by Maximum the Hormone - Death Note

[vash9898]

well right now..

1.Tank! (Cowboy Bebop)
2.The Real Folk Blues (Cowboy Bebop)
3.Zetsubou Billy (Death note)
4.Scramble (School Rumble)
5.The Cruel Angel's Thesis (Neon Genesis Evangelion)

:3

[Piccahoe]

1. Puzzle (welcome to NHK) - song fits me
2. For Fruits Basket (Fruits Basket)  One quote "I was so happy when I saw your smile, a smile that melts everything away"
3. The World (Death Note) an awesomeness
4.  Clannad (opening 1)  sweet but sad song
5. Rewrite (FMA) good lyric, kick ass song

[Liquid]

1.) Rain - Steve Conte - Cowboy Bebop (The main one used in the series is the female vocal version, but I love Steve's version better.)
2.) Heaven's Not Enough - Steve Conte - Wolf's Rain
3.) Beauty is With Us - Scott Matthew - GITS: SAC
4.) Wind - Akeboshi - Naruto
5.) What's Up People - Maximum the Hormone - Death Note

[JohnnyAR]

1. WORLD END (Code Geass R2 2nd OP)
2. Don't say "lazy" (K-ON! ED)
3. Trust (Vandread)
4. Red Fraction (Black Lagoon OP)
5. Discotheque (Rosario Vampire Capu2 OP)

[morgaine]

1.  Kuroi Namida - Anna Tsuchiya (NANA)
2.  Tell Me What the Rain Knows (Wolf's Rain)
3.  Houseki - Marina Inoue (Le Portrait de Petit Cossette)
4.  Inner Universe - Origa (Ghost in the Shell)
5.  In This Serenity - Mayumi Gojo (Xenosaga)

[LordKefka]

Holy snap foo! " Sweet Bitter Beauty Song" - K-On just moved to my top 5... this thing rips so harrrrdd...

[xXunyuuXx]

Lots of nice opening and ending came out for this season >o<