Darker than Black, Claymore, Lucky Star, Sayonara Zetsubo Sensei, School Days, DMC, Code Geass ep 24/25. Anyway for School Days... NICE BOAT! <--- that is if you know what i mean

Saiunkoku Monogatari 2nd Series
Mahou Shoujo Lyrical Nanoha Strikers
Yes! Pretty Cure 5
Kamichama Karin
Code Geass Lelouch of the Rebellion
Romeo x Juliet
Kidou Senshi Gundam SEED Destiny Special Edition Kanketsu Hen: Jiyuu no Daishou (The Cost of Freedom)

Since i already saw episode 19 of Gundam 00 my opinion of the series changed a lot, so i must say its my favourite from 2007 animes, the story is really well done, every episode comes with a lot of surprises. Also liked Clannad and Hayate no Gotoku over most others.

Ef, Gundam 00 and Baccano

i saw some of it, but the best is :

El Cazador
Romeo x Juliet
Lovely Complex
Kaze no Shoujo Emily
Mushi-Uta

1.Tengen Toppa Gurren Lagann
2. Code Geass
4. Ef
5. Dennou Coil
6. Lucky Star

Code Geass: Lelouch of the Rebellion

there are too many great productions, all have their special places in their own rights... must name a number then i'll pick in order of preference 1) Shuffle! Memories; 2) Clannad; 3) Claymore & 4) Lucky Star

Let's see based on what DVD purchases/fansubs I've seen...

The Wallflower (saw eps. 3-8 fansubbed before it got licensed by ADV Films)
Seto no Hanayome (missed out on like 4-5 eps, currently up to ep. 18)
Please Teacher!
Please Twins!
Fafner
Yukikaze
Zegapain (up to ep. 4)
Moon Phase (up to ep. 5, need vols. 2 and 5 to finish the series)
Ghost in the Shell: SAC

I would say the best anime of 2007 would of been CLaymore for me.

I Think Devil May Cry and Naruto Shippuuden

darker than BLACK, MS Gundam OO, Kaze No Stigma, tokyo majin gakuen kenpuchou

seriously, only one person mentioned sayonara zetsubou-sensei?! i know having to pause here and there to catch all the jokes is annoying but it is an awesome series... and the whole 2nd season is already out!

i also realise that there are some people not sticking to the 2007 category...

Naruot Shippuden and Death note i dont know if you mentioned Death Note tho

i would choose claymore!

Well, I haven't watched all of them, and I'm sure that most of them are pretty good. Among those that I watched I'd prefer:

Devil may cry
Darker than Black
Clannad
Zero no tsukaima
Shakugan no shana

Claymore
EF a tale of memories
Minamike
Shion no Ou
seirei no moribito
tengen toppa gurren lagan
higurashi
Nodame Cantabile

Ummm, Claymore

if me.....i choose kaze no stigma and romeoxjuliet..
cuz not all the anime i been watch...

lovely complex of course!

there´s nothing else!

because it´s absolutly sweeeeeeeet!

without a doubt some is claymore by its impressive history and their combats are simply one of the best ones animates that I have seen