Since FinaleTI has already stolen NGE, I'll have to steal all the rest :P
Notice the similarity of this one with the TTGL OP (Hence the video).
Some more of my favorites.
And graphmastur already posted the Death Note openings...
But he forgot the endings. ;)
There is 1 opening and 4 endings that I like, in which there's a forbidden one :P
First off - Yu-Gi-Oh 5D's. Yeah, you can rip my head off now. :P
It actually isn't that bad of a series. Plot isn't too bad, especially for the semi-middle and ending parts (Season 2 and Seasons 4-5, which I haven't gotten to watching). The sub versions are the ones you should watch if you ever decide to taste it. ;) (The dub versions sound terribly pathetic... as it the voice actors were held at gunpoint at the same time they're recording... :P) This is the only sub-series of Yu-Gi-Oh that I like - this one doesn't revolve (too much) on "OMG CARDS!! OH LOOKIE A CONTEST!!1! MUST WIN MUST WIN!!!!" :P (The new one, Zexal, is pretty much like this as well... in fact, their opening almost wants you to look away due to its extremely kiddy nature:
Anyway, here's one opening and two endings:
The next anime that is probably much more appealing but less known - Xam'd: Lost Memories* (亡念のザムド, Bōnen no Zamud). It's only released on PSN and DVD/BD, and just recently can be spotted as well on Hulu and Anime Network. (It's "web anime", as the term on wikipedia goes.) If you're not a person that doesn't mind some slightly alien looking characters (hint: Ben 10), this is not for you. This anime tends to have the lovely elements of swag, story, and character development. Due to the swag, I'm never ever going to show this to a little kid... :P The openings are evil lies; the endings tell a bit more of the series true core. (The "swag" == "offensive material", so beware if you are a person who is offended by this kind of stuff.)
(NOTE: These don't have the credits overlaid. If you are looking for them, you can try and find them - they're somewhat hard to find, surprisingly. :P)
Drooling at the amazing animation quality? Thank Bones for that. They also animated Full Metal Alchemist, so you might see a similarity between the two.
* Did I mention that YGO ZEXAL's plotline somewhat looks like this? :P
ZEXAL's plotline base also looks like Soul Eater's one as well, especially with the number 99.
Unfortunately, this opening never made the english dub, but I love it soo much!
Gotta give the classics some love, right?
I just had to bump this, since I love this song, along with all the other stuff T.M. Revolution has done, such as Resonance or Invoke.
I absolutely love the songs from The Melancholy of Haruhi Suzumiya.
Also, from same voice actress as Haruhi, I like Lucky Star. Konata is cute :3
^ It's the German opening, but I like it more than the Japanese one.
^ This show just became one of my favorite animes, mainly because of how awesome Date Masamune is.
This is the last ending for season two, but I couldn't find the actual ending/didn't want to spoil it, since I'm a few episodes away from it, and Season 2 is starting to get really epic.
I'm watching K-ON!, it's pretty nice :)
And one of my new favorites:
To celebrate the debut of Shakugan no Shana Final today, here's the full version of the first OP! ;)