Yes, I do -- the Vocaloid program used Japanese voice actresses, anime actresses, to create the singing voices. Asakawa Yuu is the voice of Megurine Luka, and there were a surprising number of people dressed up as that character at her panel. I went because I love her voice in Azumanga Daioh and Love Hina and just in general, but many others knew her voice from the Vocaloid software.