She's awesome! That song was an OP to Rental Magica(
The song is Sora ni Saku, but it also translates to Uchuu ni Saku.). She also sang that song in English, which is entitled 'Faith'.
She also has a full length album entitled 'Nijiiro no Kotonoha' which was her debut album and was released January 3rd I believe, of this year.
Her song 'Tears' went to the famous anime 'Mobile Suit Gundam SEED DESTINY'. I'll post a link up in the download section once I get my hands on her album again, but I do have all four of her singles that she released. =D
I'll post those in a bit.