Pretty much EVERYTHING Hayato Miyazaki has done since Kiki's Delivery Service.
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Howl's Moving Castle was the shit though.
I've found that stuff becomes overrated the second they start selling its merchandise at Hot Topic. Incidentally, Death Note is one of my favorite animes. It's just starting to cross into overrated territory, though. Rather than jump on the DBZ/Bleach/Naruto/EVA bandwagon, I'm also gonna go with Akira. I will acknowledge that the movie is a classic, and I own it myself, but it's certainly not the ULTIMATE anime.
For underrated stuff, I almost never hear about Gungrave. Shitty as the game is, the anime has one of the best stories I've seen. They took characters that had little to no background in the game and fleshed them out so well you actually gave a shit about the guy who turns into a motorcycle with fists. (Glad they changed that for the show.) Grave vs Bunji stands as one of my all-time favorite anime fights for this very reason.
Jam it back in, in the dark.