For adults, i think xxxholic is great! but let's not go there. ;)

I will try soul eater.

Guys, tell me who watched beast wars when you were a kid!!!!

Tengen Toppa Guren Lagann
K-On!

darker than black, code geass, spice and wolf, soul eater, clannad.

As for some of my old favorites, zero no tsukaima, shakugan no shana and toradora (all share the same lead female voice actor)

I have lots that I like, I wouldn't even call most of the above listed my favorites, but they are what I vaguely remember and stick into my mind.

Listing time!

-Beck Mongolian Chop Squad
-Ghost Hunt
-Blood+
-Keikashi
-(ALL) Full Metal Alchemist
-Zatch Bell (for fun)
-Witchblade
-Devil May Cry the Animated Series
-FLCL (a.k.a. Fooly Cooly, or Furi Curi)
-Balsa
-Samurai Champloo
-Cowboy Bebop
-Afro Samurai
-.hack//sign (or any other .hack//)
-Hellsing
-Trigun
-Code Geuss
-Death Note
-Samurai 7
-Inuyasha
-Texhnolyze
-Ghost in the Shell
-Evangelion
-Project ARMS
-The Big O
-Rurouni Kenshin
-Full Metal Panic
-Samurai X
-Tenchi Muyo!
-s.CRy.ed
-Wolf's Rain
-Vagabond
-Ninja Scroll
-Blue Seed
-Blood: The Last Vampire
-One Piece
-Yu-Yu Hakuso
-Silent Mіbius
-DNAngel
-Vandread
-Akira
-(of course) Naruto
-(of course) Bleach
The two greatest animes ever made.

I have more, but I can't think of them at moment. I also have movies I could recommend.

Since you appear to be into the more action oriented anime, i'd suggest Fullmetal Alchemist and Bleach.

I need a bit more information about the anime that you like if you plan to get DECENT recommendations. People seem to be throwing their entire favorites list of anime out.

Based on the fact that you like Action and Supernatural/Ability type animes, try

D. Gray-Man
To Aru Majutsu no Index
To Aru Kagaku no Railgun

Damn. How'd I forget D. Gray-Man. High Recommendation.

Guys, check this one out!

Vampire knight

A action/love story anime!!

I left forums for two days because i couldn't stop watching!

Really great story!

Fairy tail is pretty good.

Why are you asking for suggestions if you ignore them and suggest your own?