Well,
Thanks to some daft prick going around and changing the demographic status of many titles, I'm not even sure if what I like is classified as shounen or seinen any more. >_>

I'll stick to my previous list (somewhere in the earlier pages)

Point & Squirt

Off the top of my head,

Planetes
20th Century Boys
Master Keaton
Emma
Sukimasuki
Heibon Ponch
Moteki
Mushishi
Go
Gunslinger Girl
Solanin
Vagabond
BECK

[We need more staff!] Visit us at: http://www.stilettoheelsteam.net/

Gantz
Futari Ecchi
Tenjho Tenge
Berserk
Haruhi Suzumiya (Novel)
Vagabond
xxxHolic
Bastard!!
Battle Vixens
Fist Of The Blue Sky and related series
Steel Ball Run and related series
Hellsing and related series

these are my top 12 in order from 1 to 12 & top to bottom

Berserk
Vagabond
Battle Royale
Battle Angel Alita
Skyhigh (currently reading Skyhigh karma)
20th Century Boys & 21st
Wolf Guy - Wolfen Crest
Gantz

"Blame!" & "Biomega" would be my favorite, pretty much anything else by Nihei Tsutomu.

Other ones up there would be
Eden
Eternal Sabbath
Ichi the Killer
Dogs

Just for the sake of throwing out an obscure one "Gon", in the end it doesn't make my top but comes pretty close

O_O. I looked back to my first post in this one...and woah...
So here's top five:

Dorohedoro
Nijigahara Holograph
Hotel
Livingstone
City in The Sea

Naouki Urasawa's Monster!

My Top manga:

1. Yu-Gi-Oh!
2. Death Note
3. Fullmetal Alchemist
4. Bakuman.
5. Love Hina

Emma
Otoyomegatari
Parasyte
Historie
xxxholic
Shin Angyo Onshi
Vagabond
Monster

[img]http://i799.photobucket.com/albums/yy272/flower_of_life/Indigo_Blue_Chapter_10_148-1.jpg[/img]

Until Death Do Us Apart----not a second of boredom with dis one
Ubel Blatt
Shin Angyo Onshi---saddest ending evaa
Gantz---the main dude goes from total wuss to badass and total player!!
Historie
Eden:Endless World
Team Medical Dragon
Kanojo o Mamoru 51 no Houhou
Biiter Virgin
Holyland

Angel Beats--best anime of the 2010 spring season

1. Nijigahara Holograph
2. Monster
3. 20th Century Boys
4. Goodnight Punpun
5. Me and the Devil Blues
6. Yokohama Kaidashi Kikou
7. Mushishi
8. Yotsubato!
9. Witches
10. Shin Angyo Onshi

5. Shin Angyo Onshi
6. Hellsing
7. Vinland Saga
8. Homunculus
9. Kozure Ookami

I can't decide on the exact order of preference, but anyway, here goes...

Mushishi - Number One for sure! I'm so sad no one else seems to like this.
Monster
Yokohama Kaidashi Kikou
Livingstone
xxxHolic
Chinatsu no Uta
Chii's Sweet Home
One Outs
Liar Game
Futatsu no Spica
Pluto

-Well that's my top eleven, at least

No order:
C.A.T
Mahoutsukai to Teishi no Futekisetsu na Kankei
Seiken no Katanakaji
Tenjou Tenge
The Ravages of Time
Wolf Guy - Ookami no Monshou
Zetman

1. Gantz
2. Berserk
3. Black Lagoon (I'm sad that I'm the only one mentioning this series) 😢
4. Vagabond
5. Blade of the Immortal
6. Battle Angel Alita
7. Battle Royale
8. Shamo
9. Monster
10. Akumetsu (Similar to Death Note, but better because crazier)

Series with actions are the best for me since I'm an action junkie except for some particular ones like Monster.

Posted in no order because I simply like all of them and can't seem to rate them.

Say Hello to Black Jack(The best medical series there ever is... why are there so few readers for it? Ah well... )
Berserk
Bokurano
Vagabond
Cesare
Historie
Vinland Saga
Majo
Hourou Musuko
Otoyome-gatari
Music of Marie
Planetes
2001 nights