I've been going through a baroque phase lately and it's totally distressing me.
My favorite as of late is Vivica Genaux, this tomboyish Alaskan mezzo. She seems to have moved away from her short hair and pants role in the last few years, but boy, can she nail the fioratura. Not only can she sing a legato, her range is incredible. Not in the link I posted, but in another version of Qual guerriero in campo armato on youtube she sings from G3-C6. Seriously, people.
She does this wierd jaw-moving thing when articulating runs...it doesn't seem to be in rhythm, so I don't know what to make of it. She's fierce nonetheless.