I think I saw most of these mentioned already, but I'll give them an extra vote:
Episodics:
Ano Hana
Death Note
Code Geass
Evangelion
Sword Art Online
Features: (aside from the usual Ghibli suspects)
5 Centimeters Per Second
Garden of Words
Paprika
Perfect Blue
Summer Wars
Voices of a Distant Star (a short, not a feature... but very, very awesome)