My top picks would be these in no order.

Pokemon

I really liked the first two seasons but then it kind of went downhill to me.

Yugioh

I enjoyed watching the original series though I couldn't get interested in the 5D followup.    

Dragon Ball Z

As a young kid (about 10) the mindless violence of this anime offered countless hours of entertainment. 

Sailor Moon

and finally the first anime I ever saw Sailor Moon I always appreciated the art style with this one ;)

Your turn feel free to list any of your favorites or laugh at my choices :)

I also liked theses

Ultimate Muscle

One Piece

Bleach

Fullmetal Alchemist

Momotarō: Umi no Shinpei (actually sponsored by by the Imperial Japanese Navy).

Hmm... my top 3 are Marmalade Boy, Gravitation, and KareKano, in that order.

I really Loved Sailor Moon, Yu-gi-oh, Pokemon, and Zoids (not sure if its actually anime though)

In no particular order:
Eureka 7
Bakemonogatari
Cowboy Bebop
Bokura Ga Ita
ToraDora
Casshern Sins

That's not including movies, by the way.

These topics come up like every two weeks, but they get me to post, so...

Yu Yu Hakusho.

Rurouni Kenshin

They have Zoids episodes online, I can't belive it took me this long to think of searching for them

They do? I searched for similar topics and didn't see any. I was hoping to be original lol.  

http://www.vgchartz.com/forum/thread.php?id=91882