Luka and Miku Duet Playlisthttp://www.youtube.com/view_play_list?p=F2F65CCDADC72487More Like This
Here's a playlist for your own enjoyment that I put together using all the Luka and Miku duet songs I could find on youtube.
If you know of more, please send me a note with the link and I'll add it to the playlist.
Special Mention (NicoNicoDouga Only Videos)
CharActer - http://www.nicovideo.jp/watch/sm11328205
Victims of the Black Lily - http://www.nicovideo.jp/watch/sm10129489