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Anything where the manga is the adaptation of an an anime rather than the other way around.
Azumanga, Cromartie, PSG, Gintama, Sora no Otoshimono, probably any non-shit comedy adaptation.
Usagi Drop.
The start of Ippo at least, and maybe the rest of the first season when they aren't cutting out fights.
Hunter × Hunter improved on the later chapters that were apparently sketched on cocktail napkins.
Sailor Moon and Mai-HiME, I'm told.