Who? I have no idea who she is too. Happened to hear her song, Yellow, stream through Pandora.com. I really like it. If you check out her website, you'll be able to find her whole album there available through streaming too.
Pandora.com is one of my favourite sites for the reason that it streams random free music. You definitely must check it out. My favourite search keyword there is "The Eames Era".
If you like that, you might want to check out Last.fm too, a Web 2.0 music streaming website.