I suggest:
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Soul Eater (this doesnt need a comment =P Just go watch it, It's my lastest addiction!)
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Lovely complex (if you like a cheerfull romantic anime)
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Samurai Champloo (it's a rather very well made anime and the story is good, I highly recommand it)
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Wolf's Rain (Slow paced anime, I just think it's beautifull)
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Zombie Loan (It was rather funny)
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Clannad (because it's a very unique romantic anime, very beautifull, I loved it)
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D.Gray Man (because it's a classic, and with 95 episodes, you won't get bored (except for it's emo main character -sigh-) Oh and I think it really get even better arround episode 70. it's rare for a anime to grow to be better and better.
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Hayate no Gotoku is just H-I-L-A-R-I-O-U-S for me. Very satyric and making fun of all the show and games arround, the story is good and cute, it's a bit unreal and doesnt make much sense but you'll love it! Give it a try!
Also, for a quick fix, and if you are really bored, I suggest all the Miyazaki's movie, specially
Howl's Moving Castle (sweet and I like the story)
Spirited Away (most people love this movie) and if not, take time to browse the
movie section (movie classic like
Akira could interrest you!)
PS: sorry for the copy paste, there so much thread like this I think I can do it =P