Favourite OP/ED?

Or Insert Song I suppose. Post your favourite (or just one you enjoy) Opening or Ending theme for an anime.

I'll start us off;
ED:
[YOUTUBE]pDGd35uMf-4[/YOUTUBE]

フレンズ - ステファニー
Friends - Stephanie
Gundam 00

For the love of me, I can't find a video with subs.

Hyuu, off the top of my head....

OP
Art wise - Pani Poni Dash! [SIZE="1"]sotheyhavethreedifferentopsbesidestheoddspecialonesshh[/SIZE]
Song wise - .hack//roots is one that's been stuck in my head recently, despite me having never seen this series.

ED
Art wise - NHK ni Youkoso!
Song wise - Kodomo no Jikan

Insert songs.... BLACK DIAMOND (Indies Version) and nowhere keep playing over and over in my head....

OP:
[YOUTUBE]pQqRN0NChe8[/YOUTUBE]

Ash Like Snow - The Brilliant Green
Gundam 00

In with the old
[YOUTUBE]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/hWanzCVruKY&hl=ja&fs=1"></param><param name="allowFullScreen" value="true"></param><embed src="http://www.youtube.com/v/hWanzCVruKY&hl=ja&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object>[/YOUTUBE]

Lmao, JoeTang, you already named the two songs that I thought of when I saw this thread.

OP:
Nabari no Ou: CRAWL
Kannazuki no Miko: Re-Sublimity
Code Geass R2: O2 and World End
To-Love-Ru: forever we can make it!

ED:
Kannazuki no Miko: agony

Er, I can't really think of any more ED's at the moment.

http://ca.youtube.com/watch?v=mvLTgPdKyR4

Anything done by MOSAIC.WAV. In fact, their entire OST puts me into OCD fits of wanting to listen to more than one at once; I fucking LOVE their discography, especially the c74 releases ;-;.

Lol i'm obsessed with this OP:
Shakugan no Shana II - Joint
[YOUTUBE]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/GacxN-749ag&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><embed src="http://www.youtube.com/v/GacxN-749ag&hl=en&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object>[/YOUTUBE]
EDIT: lol fixed