Sounds interesting! I watched "Yuzurenai Negai" at http://www.youtube.com/watch?v=B2PRnoVKRcc but wished they could give it the Animelo treatment rather than the Animax treatment - ie decent quality sound and video, not trying to hide the backing musicians, taking the time to mix down a decent version.
Chihiro Yonekura and Naomi Tamura did a great version of it at Animelo Summer Live 2010.