oooo how hard.

Favorites all-time? Slayers, Kenshin, Inuyasha, 
Violinist of Hamelin, Trigun, and Gokudo.

Favorites right now? Naruto and Elfen Lied.

Very close runners up for all time periods would 
be Gravitation, Fruits Basket, Kimagura Orange 
Road, Excel Saga, and Evangelion.  Oh, and 
Hakkenden.