I don't watch much anime, almost no anime at all. Alot of the shows aired in the United States are...well...overrated. xD [*cough* Naruto. *cough*] And I use to majority of my free time to music instead of anime. But nonetheless...

All the openings and endings of the NANA series are awesome. <3

Openings:

Round Table ft. Nino - Let Me Be With You [Chobits' Opening]

It's groovy and cute. ^_~ The vocals are quite high-pitched, but controlled and soft.

Shing02 - Battlecry [Samurai Champloo opening]

I'm not a fan of hip-hop but anything with Shing02 is awesome.

L'arc~en~Ciel - Blurry Eyes [DNA2 opening]

It's L'arc~en~Ciel, so it's obviously wonderful. =3 I remember watching this anime long ago. I was young back then...watching a perverted anime. xD

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Endings:

Suki Dakara [Bokura ga Ita ending]

Ningyo Hime [Chobits second ending]

THE BEST ENDING EVVEEEEEEEEEEER:


Minmi - Who's Theme [Samurai Champloo Ending]

Love it, marry it. xD It's so lovely! The relaxing atmosphere, the controlled vocals...AH! I can't explain! I wanna marry Minmi. I find it to be a inspiring song, with a melancholy feeling.