Just thought I'd put my two cents in here.
My ultimate favorite has got to be Fruits Basket. I love it, my sister loves it, her boyfriend now (I don't think I can say loves it!) but he's at least interested enough to have asked to borrow the second disk of it. Woohoo! Another fan

I also liked Toki wo Kakeru Shoujo (anime movie), Gravitation, DN Angel, Ouran High School Host Club, Loveless... the list goes on. Also, I've got to admit that I too liked Marmalade Boy. It was rather good and unexpected, since it's such an old anime (1994-1995!) with old graphics. I usually like the pretty looking anime series', but I'll make an exception for this one

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Oh, and bakabakashi, about Death Note, I'm not sure if you've watched it now, since it's been a while since you posted that message - but I haven't watched the anime yet, but I did just watch the three live action movies and enjoyed them quite a bit. The anime version is also on my list of things to watch

And about the manga, I also haven't read those manga, so I can't comment on those either.