Zoë Keating
She is a classically trained cellist producing her own albums while composing music for TV, film and ballet. Her instumental ambient-chillout melodies set a mellow atmosphere. Zoë Keating has one free track available on Last.fm, Exurgency, however the leading track from One Cello x 16: Natoma is also available to listen to in full.
[audio:http://sesam.hu/wp-content/uploads/2011/08/Zoe-Keating-Exurgency.mp3|titles=Exurgency]
Neil Gaiman seems to appreciate her as well.
Also, if you like cello, don't forget to check out 2CELLOS and Misi Várnagy.