As it says, what's your list? As a general rule, for an anime to be eligible, it'll have to finish airing in 2008, or maybe a few days after. If your list shows otherwise, just give us a yell on how you classified things.
My take was:
First Place: Code Geass R2
Runner up: Macross Frontier
This one was really hard for me. I remember when I first watched both endings, Macross was definitely the one I was most pleased with. But after that, R2's finale got a few more replays than Frontier's. CG for the actual scenes and story, Macross for the music. I guess missile spamming gets less exciting the more you watch it, while Removed spoiler CG's last scene still remains captivating. It's marginal, but it sits better with me to name R2 on top of Macross.
Next top 5 (in random order):
Clannad (1st Season)
Gundam 00 (first season)
Allison & Lillia
Vampire Knight Season 1
Ga-Rei Zero
(ef - a tale of melodies would most likely be on the list, but I haven't finished that yet)
People be smart about it. Don't fucking spoil in this thread. Don't give details out about endings, etc. from the series you're commenting on. Use some common sense.