Current (which includes Shippuden): Fate/Stay Night. Fate/Zero. Wolf's Rain.
Used To Watch: Naruto. Inuyasha. Bleach. Fruit's Basket. Rosario+Vampire. Pokemon. Yu-Gi-Oh!. Beyblade. Code Lyoko. Avatar the Last Airbender. Stuff like that. It was usually on Cartoon Network back in the days...good times.
The mainstream trilogy (their names should go without saying) are favorites of mine.
Yu-Gi-Oh! was an old favorite, though I stopped watching the spin-offs after the second season of GX!.
Code Geass was pretty interesting, as was Inuyasha, though I never really got into the latter.
It's kinda hard not to watch anime and not see and/or like DBZ imo.
All time, it would have to be Death Note. The plot and the constant mind-battle between Light and L were simply epic and when it came down to it, I almost feel bad that he failed.
And that's it. Not much of an anime fan. I was surprised when I started watching Naruto and actually liked it. Before that I just related the word Naruto to a kid with an annoying voice who screamed all the time and wore an orange jumpsuit.
Also, I had heard that "if it's in Naruto, there's porn related to it".
One Piece, Bleach, Full Metal Alchemist, Death Note, D. Gray-Man, Fairy Tail, Soul Eater, Wolfs Rain, Devil May Cry, The blue Exorcist, Kyo Kara Maoh, InuYasha, Black Cat, Avatar, Kuroshitsuji, Neon Genesis Evangelion ... and much more
-->thing is don't start too many catching up will screw u over - like it did me!
- Fairy Tail
- Detective conan (this one would be cool to kill some time)
- Black Cat
- Pokemon
- Inazuma Eleven (if you like sport (soccor))
- Full Metal Alchemist
- One Piece
- Dragon Ball Z
- ....
there are many more, but am to lazy to list them
those are ...
DBZ ,
InuYasha ,
Ghost Fighter ( awsome .. u should watch ) ,
Pokemon ,
Black Cat ,
Dexters Lab ,
Courage The cowerdly dog ( hilarious ! ) ,
Cardcapture Sakura ,
Flame of Recca
Toradora- a serious romance (my first good tsundere anime)
Soul- eater action was awesome but it was way different from the manga and shorter.
GTO- Onizuka teacher life? is the greatest hero in my opinion
Trigun- action another great hero
Angle Beats- good silly romance, good story
Elfen Lied- very VERY violent Lucy is arguably the most violent anime charter ever
Baccano- Acton kinda confusing it's like vantage point
kenichi- action you will learn martial arts lol
and there are quite a few other one's but also it depends on what you like.