Kuragehime OP (Koko Dake no Hanashi) vs. Romeo x Juliet OP (Inori ~ You Raise Me Up ~)
Kuragehime has more creative visuals, but I like the RxJ song better.
RahXephon OP (Hemisphere) vs. Cardcaptor Sakura OP3 (Platinum)
War of excellent Mayaa Sakamoto songs.
Hellsing OP (Logos Naki World) vs. Slayers Next OP (Give a Reason)
Easy.
Sengoku BASARA Op (JAP) vs. Full Metal Panic! OP (Tomorrow)
Sure, for all that Sengoku Basara's OP is fun.
Last Exile OP (Cloud Age Symphony) vs. Vandread 2nd Stage OP (Justice)
Not Vandread.
.hack//Roots OP (Silly Go Round) vs. Macross Frontier OP2 (Lion)
Lion has really grown on me, and is probably #2 of this 8.
Shin Getter Robo: Armageddon (Heats) vs. Angelic Layer OP (Be my Angel)
Apathy.
Infinite Ryvius OP (dis-) vs. School Rumble OP 1 (Scramble)
More fun.
Endings
Excel Saga ED (So You Are Going to Eat Me) vs. Needless ED1 (Aggressive Zone)
Sayonara Zetsubou Sensei ED1 (Zessei Bijin) vs. Dragon Ball ED (Romantic Ageru Yo)
Bokurano ED (Vermillion) vs. Toradora - ED1 (Vanilla Salt)
Persona - Trinity Soul ED2 (Found Me) vs. Last Exile ED (Over the Sky)