Catchiest theme song

[Aru Sakayama]

Bamboo Beat [Bamboo Blade OP]
Star Rise [Bamboo Blade ED]
Kero March (Ribbit March) [Keroro Gunsou/Sgt. Frog OP]
Pekopon Shinryaku Ondo (Pekopon Invasion [Folk] Song) [Keroro Gunsou/Sgt. Frog 2nd ED]
Kagayake GIRLS (Shine! GIRLS) [K-ON! OP]
Watashi ni dekiru koto (That Which I Can Do) [Strike Witches OP]
Shoujo Q (Girl Q) [Pani Poni Dash OP]
Datte, daisuki! (But, I love you!) [Tenshi ni Narumon OP]

[Yuki Valentine]

I still think the Evangelion theme is the catchiest.  It's just such a classic too.  ;)

But Tank is great too.

[TC X0 Lt 0X]

I am loving Omamori Himari's OP right now...

[c2chaos]

Spice and Wolf ED - Whistling Wolf by Rocky Chack

[Haruka]

Yozurenai Negai has been stuck in my head going on three days, now.

[otakuya]

Recently:
http://www.youtube.com/watch?v=bsngnTIWCc0
http://www.youtube.com/watch?v=aHl4wCkdec0&feature=related
http://www.youtube.com/watch?v=5cJB0ZdOrBc

[Angelx624]

Man it sounds more like you guys are just listing songs you like... over catchy.

Any Pani Poni Dash song
Dokoro Op
Popotan Op/Ed
Konya Wa Hurricane - Bubble Gum Crisis
Beck Op
School Rumble Op/Ed
School Rumble S2 Op
Lum no Love Song- Urusei Yatsura
ALL THE MUSIC FROM KERORO GUNSO
Gokujou Setokai OP
Airgear Op
Tenjou Tenge Op
Azumanga Daioh OP
Ichigo Mashimaro OP
Vs Knight Ramune & 40 Fire OP
Vs Knight Ramune & 40 Fresh OP
Sister Princess Op
Sobakasu - Rurouni Kenshin
Mahoromatic both ED
Sousei no Aquarion Op <=- Half of Japan has this stuck in their head even if they don't watch cartoons, because of commercials and popular air time.







and Denver the Last Dinosaur op(YOU'RE WELCOME EILEEN!)

YAY for Ichigo Mashimaro, Azumanga, and Sister Princess!! :3 I could not stop listening to the Ichigo Mashimaro opening after I first heard it! XDDD

And any song from TMOHS!! =P

Also:
Petite Princess Yucie OP
Super Gals OP
All the versions of the Negima OP(all songs from that anime are awesome!! XD)
Any Macross Frontier song!!
Pokemon English OP(yesh, I admit it, I find it catchy XD)
Any Di Gi Charat song

That's all I can think of, right now. >w<;;

[CorellianJones]

Do You Remember Love from Macross...Not really a theme song, but I do think of Macross whenever I hear it

http://www.youtube.com/watch?v=GP2hzhnhyvk&feature=related

The original Speed Racer

http://www.youtube.com/watch?v=vtIu61s2PDo

The original Ranma ½ opening (could never get that tune out of my head)

http://www.youtube.com/watch?v=XW9BapLxwkw

Lucky Star opening (Watched the entire series and ended up making an AMV out of it for my troubles)

http://www.youtube.com/watch?v=ieQ1rAIjzXc

Soul Eater (Really great song and even better animated opening. I put together an AMV that will hopefully make it into Fanimecon AMV Contest this year)

http://www.youtube.com/watch?v=WMK_xzkYM8s

[Angelx624]

Soul Eater's 2nd Opening is also great. ^_^ Gotta love Tommy Heavenly6. :3

[PyronIkari]

Do You Remember Love from Macross...Not really a theme song, but I do think of Macross whenever I hear it

Uh... Do You Remember Love was the main theme song from... Macross: Do You Remember Love. It wasn't in the original series.

[CorellianJones]

Do You Remember Love from Macross...Not really a theme song, but I do think of Macross whenever I hear it

Uh... Do You Remember Love was the main theme song from... Macross: Do You Remember Love. It wasn't in the original series.

You're being picky about when the song appeared?

Look, it was a long time ago; I liked the animation and most of the songs from Macross. You obviously take umbrage at my description of the song. I'm sorry, but I was a casual watcher of the series. I had a friend that could go on for hours about the technical specs on the mecha in the show and hated the fact that I always brought up that those specs are meaningless because those craft, that technology, those characters, were all fiction. I thought he was a bit obsessive.

I'll defer to whatever you say. The bottom line for me is I happen to like that song along with a few others from Macross; Whatever Macross it happened to have come from.

[PyronIkari]

You missed the point. You said it wasn't a theme song. It was literally the theme song.

[Echo♔]

Anything from Nana is catchy. Plus I love the theme song from Azumanga Dioh.

[CorellianJones]

You missed the point. You said it wasn't a theme song. It was literally the theme song.

I regret having ever mentioned the song. I already said I will defer to whatever you say about this matter. I've already said I'm sorry you take umbrage about my description. What more do you want from me? I'm sorry I said it wasn't a theme song? I apologize that I didn't rightfully say it was literally the theme song? Is that the point I'm missing from your complaint? Well then, consider those now said by me right now and right here.

[AnimeFans4Yaoi]

I think my top three favorite anime theme songs are:

1. The Original Pokemon Opening Theme (of course! <3)
2. Air Gear's Opening Theme Song & Ending Theme (then again I LOVE all the music in that anime, SkankFunk rocks!)
3. Hellsing Opening Theme Song (My top favorite anime of all time)

[isshinkun]

"Sha la la -Ayakashi NIGHT" by Saeka Uura 1st opening to kekkashi
Uura saeka - mai mirai  3 ending to kekkashi

[koji]

If catchiest,

Yuusha Oh Tanjou! from GaoGaiGar
Sousei no Aquarion from Sousei no Aquarion  ;D