"Kiseki No Umi ver1.0" was a milestone of Miku's human singing emulation.
Inspired by the Niconico douga viewer's comments on ver1.0, revised version(ver1.1) was released.
"Kiseki No Umi" Ver.1.1-Release (The Record of Lodoss War OP)
http://www.youtube.com/watch?v=1A4nAvJ5-uE
In addtion, the special version was released for purpose of comparison.
In this version you hear different voice from left and from right.
Left: Sakamoto Maaya (original voice)
Right: Hatsune Miku
This clearly demonstrates the excellence of the voice emulation of ver1.1 song.
"Kiseki No Umi" L:Sakamoto Maaya, R:Hatsune Miku (on Niconico douga)
http://www.nicovideo.jp/watch/sm1270953
Zipped MP3 files (includes "Kiseki No Umi" ver1.1 and L/R comparison)