There are (at least) three artists by this name.
1) Chihiro is a Japanese r&b artist. Her debut album "Jewels" was released on July 25, 2007. Featured on this album were collaborations with Zane from three NATION and Shin from CLIFF EDGE. After three singles, she is releasing her next album "Dress" on November 11, 2009. This album features collaborations with HI-D and Sweep.
2) Chihiro is most well-known for her song "Honey", released on May 21, 1999. It was the second ending for the anime Cardcaptor Sakura.
3) Chihiro, named after the character from Miyazaki's Spirited Away, formed in 2005 at the University of East Anglia. They play an indie-poppy brand of folk music. Their second gig was a support slot with The Kooks and The Subways. Read more on Last.fm.