Wow... this many replies and no-one has mentioned Kikuko Inoue? That's... just wrong. Belldandy (A!MG), Uraha (Air), Shuko (Angelic Layer), Chitose (Chobits), Yayoi (Happy Lesson), Alv (Kiddy Grade), Yukariko (Mai HiME/ Otome), Mizuho (Onegai Teacher/ Twins), Nanase (Yumeria - my favourite of her recent roles), to name but a few of her awesome roles. Damn, she rocks
And look at my sig for the other of my favourites.