There are so many anime related songs out there that I like, I can't possibly choose... I'll go with something recent ones for now though :)
- Gosick opening
- Tiger and Bunny Opening 2 ( I think I like this one just because of the drills on Rock Bisons shoulders xD )
I also like the first one as well :)
- Steins;Gate opening
Oh yeah and for mai waifu :D
Spoiler:
Could only find a video with a still pic and the music but not the actual ED theme video itself... Oh well, long as Hinagiku is in the picture I'm more than happy :)
[font=comic sans ms]My absolute favorite would be Oasis "Falling Down" from Higaishi no Eden (Eden of the East). One of my favorite bands from my teenager days doing the opening for one of the best animes is pure win in my book.
Spoiler:
[font=comic sans ms]note: Design Student's Orgasm: Opening credits with a cyan/magenta-colored theme, overloaded with text, various elements related to the story and slowly-growing flower motifs.
Lets see, my favorite anime song? It would have to be Yatte Koi! Daisuki, the OVA song for To Love-Ru. A close second is a three way tie with Ma-Ka-Se-Te Tonight from Kore wa Zombie Desu ka, Motteke Sailor Fuku from Lucky Star, and Macademi Wasshoi from Magician's Academy (Macademi Wasshoi).