I've seen them all except for Only Yesterday, Pom Poko, My Neighbor The Yamadas, The Cat Returns, and Tales from Earthsea~~ Spirited Away, Princess Mononoke, and Castle in the Sky are my favorites.
I'm gonna see Pom Poko later today~ I rented it from the library :)
from their movies I've seen:
Castle in the sky
Howl's Moving Castle
Grave of the Fireflies
Kiki's Delivery Service
Pom Poko
My Neighbor Totoro
Lupin III: The Castle of Cagliostro
Spirited Away
The Cat Returns
Only Yesterday
Whisper of the Heart <~~~~ my fav.
Tonari no Yamada-kun
Yup! They are always awesome with great art and storyline. The stories teach us some values without sounding preachy at all. In fact, the first animation movie I watched was Totoro