Fate/Stay Night
Gun x Sword
Code Geass
Gundam Seed/Destiny
Tenjou Tenge
Mahoromatic
Inukami

Mai-HiME = 6+ times
Hikaru no Go = 2 times
R.O.D TV = 3 times
Sailor Moon (my all time favorite, no lie)
Full Metal Alchemist = 3 times
Ouran High School Host Club = 3 times

I only re-watch anime shows when I feel reminiscent, bored or just don't like the new series! all these shows are 20episodes+ each

Serial Experiments Lain (my fave)
Fruits basket
Bleach (Astig~!) hehe >=0000000~~~~~!
Shingetsutan tsukihime
D.grayman >=0!

Pretear
Ouran High School Host Club
Black Blood Brothers
Kaleido Star
Jubei-Chan
hihi^^ that is them i can see over and over again^^ nyha

Suzumiya Haruhi no Yuutsu. Never tired see this anime.
Nn Evangelion is not bad either.

i'de say Naruto and Bleach. i enjoyes them cause there is nothing to do during the day except watch my granny cook (no way) i never get tired of watching them over and over because it made me feel...well happier ^_^

Naruto, FMA, fate stay night. I can just watch them over and over.

I watch anime over and over :

Chrno Crusade
Samurai deeper kyo
Samurai Champloo
Tenjou Tenge
Yami no matsuei
Ghost Hunt.....
and many over

I'd watch an anime over and over again for its story more often than not. Especially the ones with fresh, NON-DRAGGING plots, or remakes of older plot structures with interesting twists. Animation style and flow is important also, but that takes second place. I am after all going to watch it more than once, so it's good if it's visually pleasing as well.

So on the list would be (no order)
Yami no Matsuei
Elfen Lied
Cowboy Bebop
Samurai Champloo
Ouran Koukou Host Bu
xxxHOLiC
~ayakashi~
FLCL
Ghost in the Shell: Stand Alone Complex
Mushishi
Le Portrait de Petit Cossette
Black Lagoon
Death Note (although I might just conveniently stop before ep 25 )
Code Geass: Hangyaku no Lelouch
NHK ni Youkoso!

... and so far, that's it.

ouran high school host club is one anime i can't get enough of or live without...its so damn funny and it has the best heroine

Ergo Proxy
Elfen Lied
Blood+
One Piece
Eureka 7
Macross aka. Robotech
Howl's Moving Castle
Laputa: The Castle in Sky
Gundam Wing
Black Cat (Maybe another once or twice )
Chobits
D.N Angel
Samurai Champloo
Samurai 7
Princess Mononoke
Trinity Blood (That's for Ion! I love his character a lot! The most innocent and passionate vampire I've seen)

Wow... I have more than 200 titles in my collection. I have seen all of them more than twice at least. Some of my fvorite series are:

Neon Genesis (I still don't undrestand it)
Macross (all of them and the robotech too)
Bubblegum Crisis 2040
You're under arest
Trigun
Ninja Scrole
Akira

Ninja Scrolls
Lodos Wars
Saikano
Berserk

Yu Yu Hakusho pwns all! WOOT!
I never get tired of watching that show. I have most of the uncut episodes on DVD to watch. I have many other animes that I like alot, but Yu Yu Hakusho is #1.

Full Metal Panic (All of them)

Rumbling Hearts

Cromartie High School

Shinchan never get tired of that lil boy x3

Blood + and samurai x reflections... I really like the concept and story line of both these anime!

Full Metal Alchemist, D.Gray Man, Bleach and um...

Well, Fate/Stay Night, Vandread, Shuffle, Elfen Lied, The Melancholy of Suzumiya Haruhi and Shakugan no Shana would probably fall in there.

The first three especially. I've watched them through about 4 times already each.

full moon kaikan phrase, and pretear

I am a big Asuka fan too so definately NGE!
Also Steel Angel Kurumi! I love the comedy of this series and the voice actors.
Happy Lesson. I love the madness!
Martian Sucessor Nadesico. Great story.

YAKITATE! JAPAN - 3 times

absolutely love that anime! just hated the ending

Final Fantasy VII (advent children)
Fate Stay Night
Zero no Tsukaima
Tokko
Full Metal Panic (all of them)
Oh My Goddes (all)
Full Metal Alchemist (the ova one (good but almost sad ending ))
One Piece and naruto OVA (not the series)
My hime
Gundam series (^^)

Not really.