My top 5 is:

1.Bakuchi Dancer - DOES
2.Ray of Light - Shoko Nakajima
3.Hajimari no Kaze - Ayaka Hirahara
4.Izayoi Namida - Yoshioka Aika
5.Toumei Datta Sekai - Motohiro Hata

Nice ones!

Mine would be:
1. Colors of The Heart - Blood+
2. Kimi-Hana - Junjou Romantica
3. What's Up Peolpe - Death Note
4. The World - Death Note
5. Alumina - Death Note

Current ones? Let's see......
1) Dancing on a Velvet Moon-Rosario Vampire
2)It's-Tsubasa Chronicles
3)Daia no Hana-Black Cat
4)Again)-FullMetal Alchemist: Brotherhood
5)Sakura Kiss- Ouran High School Host Club

My current TOP 5:
1. Tada Aoi - Brave Song
2. Lia - doll (Lia version)
3. Lia - Toki wo Kizamu Uta
4. BoA - Every Heart ~Minna no Kimochi~
5. Namie Amuro - Come

1. The World Without Logos - Hellsing
2. Aozora No Namida - Blood+
3. Diva - Blood+
4. Lonely in Gorgeous - Paradise Kiss
5. 19sai - XXXHolic

Hologram-Full Metal Alchemist:Brotherhood
Let It Out-Full Metal Alchemist:Brotherhood
Pounding of My Heart-Case Closed
Again-YUI (Full Metal Alchemist)
Summer (Days) Without you-Case Closed^^

..if that's what you mean :P

Here :
1.Imitation-Fate/Stay Night Unlimited Blades Works (Tainaka Sachi)
2.Continued Story-Code Geass R2 (Kuroishi Hitomi)
3.Shinkai no Kodoku-Gundam Seed Destiny (Kuwashima Houko)
4.Change-Bleach (Miwa)
5.Believe-Gundam Seed (Tamaki Nami)

These are my songs:
1. Flower of bravery by fripSide (Koihime Musou)
2. Saikyou×Keikaku by MOSAIC.WAV (Sumomomo Momomo)
3. Super Love by Koi Koi 7 (Koi Koi Seven)
4. Hajimari no kaze by Ayaka Hirahara (Saiunkoku Monogatari)
5. Shine by L'Arc-en-Ciel (Seirei no Moribito)

Here's mine
1.No,Thank You (K-ON!)
2.Every Heart (InuYasha)
3.Sorairo Days (GURREN LAGANN!)
4.Again-(Fullmetal Alchemist)
5.Tsuuka Chiten no MUSICA -(Suzumiya Haruhi no Yūutsu )

For now...
1. Tamura Yukari - Hoshizora no Spica
2. Shimamiya Eiko - Naraku no Hana
3. Shimamiya Eiko - Higurashi no Naku Koro ni
4. Kawada Mami - JOINT
5. Kugimiya Rie - Honto no Kimochi

1. Sakura Kiss~ Ouran High School Host Club
2. Baby Low Tension~ Peach Girl
3. For Fruits Basket~ Fruits Basket
4. Shissou- Ouran High School Host Club
5. Everyheart- Er... I'm not sure. I think it was InuYasha.

1.Takashi Kondo & Toshinobu Iida- Sakura Addiction~ Katekyo Hitman Reborn
2.Keita Tachibana- Michishirube~ Katekyo Hitman Reborn
3.Akeboshi- Wind~ Naruto
4.CHERRYBLOSSOM- Sakura Rock~ Katekyo Hitman Reborn
5.SxOxU- Funny Sunny Day (japanese version)~ Katekyo Hitman Reborn

Braveheart-Black Rock Shooter
Dango Daikazoku-Clannad
Uso-FMA Brotherhood
Stairway Generation-Gintama
Dear Future-Mawaru Penguindrum

You will rule the world-Sebastian (kuroshisuji)
Aru shitsuji no nichijou-Still sebastian (kuroshitsuji)
Kokoro no tamago-shugo chara op1
black Diamond-Utau (shugo chara!)
Motokke! sailor fuku-Lucky star op

Colors of the heart-blood+
Sha la la-naruto shippuden
Lovers-naruto shippuden
Hero's come back-naruto shippuden
Core pride-ao no exorcist

1.K-ON!-Don't say lazy
2.Shimamiya Eiko- Higurashi no naku koro ni
3.Colors of heart-Blood+
4.Lia - My Soul, Your Beats!
5.Lacrimosa-Kalafina (Kuroshitsuji)

Oppa in love! - UNNKN [ Umineko.. ]
Alumina - Death Note
Naraku no Hana - HNNKN [ Higurashi.. ]
Catch you catch me - Cardcaptor sakura
Sweet Romance - Yumeiro Pattisierre

Shinjitsu no Uta- InuYasha
Joint- Shakugan no SHANA
Dango Daikazoku-Clannad
Grip!-Inuyasha
Change-Bleach

How about...

Light My Fire - Shakugan no Shana
I'll Believe - Shakugan no Shana
Hayate no Gotoku! - Hayate no Gotoku!
Heaven is a Place on Earth - Hayate no Gotoku!
uh...
Wonder Wind - Hayate no Gotoku!

1. My Dearest - Guilty Crown
2. Pre-Parade - Toradora!
3. Crawl - Nabari no Ou
4. Ft. - Fairy Tail
5. After Dark - Bleach

1.Shiver-The Gazette(Kuroshitsuji)
2.Sky's The Limit-Shihoko Hirata(Persona 4 the animation)
3.Bird-Yuya Matsushita(Kuroshitsuji)
4.Trust me-Yuya Matsushita(Durarara)
5.My dearest-Supercell(GUILTY CROWN)

1. Monochrome no Kiss---> Kuroshitsuji
2. Sekai de Ichiban Koishiteru---> Sekai Ichi Hatsukoi
3. Shiver---> Kuroshitsuji
4. Kawaita Sakebi---> YuGiOh!
5. Kaze Ni Naru---> The Cat Returns (that counts right?)

My top 5:
1. Gomen ne - XXXHOLiC Rou Adayume
2. Kimi no Shiranai Monogatari - Bakemonogatari
3. My Dearest - Guilty Crown
4. Tsuyogari - Beelzebub
5. Marukaite Chikyuu - Hetalia

1. Forever by Savage Genius (Erementar Gerad)
2. Shura by DOES (Gintama)
3. No Regret by Koda Kumi (Law of Ueki)
4. Ichibyou no Refrain by Otoha (Getbackers)
5. Complication by ROOKiEZ is PUNK'D (Durarara!!)

1. Rain (FMAB)
2. Sorrowful Illusions (D Gray Man)
3. Resonance (Soul Eater)
4. Snow Fairy (Fairy Tail)
5. Let it out (FMAB)

1.snow fairy by funkist
2.hajimari no sora by plus
3.guns on by unknowns
4.no thank you by htt
5.fairytail op 12 full

5. link
4. link
3. link
2. link
1. Gravitation (Heroic Age)