Short-listed for the Mercury Prize (twice, the first time at 16), 20-year old Laura Marling is the real thing, if you're looking for a post-Dylan, post-Mitchell singer/songwriter.
The Guardian interviewed her last week and made a video that is actually somewhat more effective than the one I've embedded here.
She admits she "didn't get" popular culture as a teenager; it's only her incipient feminism that's dissuaded her from wanting to live in a Jane Austen novel ("I don't think I'd want to be a woman held back by her generation, that's not ideal.") And her ideal day off is "a nice café and a crossword". "I think I'm quite... not prudish in an extreme way but... I think I quite like things to be polite and elegant."